If you're searching for the best Cummins engine for towing, you're not alone. Cummins engines are known for durability and torque, but each platform has strengths depending on your towing needs.

This guide compares the 12 valve, 24 valve, 5.9, and 6.7 Cummins engines to help you decide which engine is best for hauling heavy loads, trailers, and work applications.

If you're ready to upgrade or replace your engine, browse our full selection of 6.7 Cummins long block engines, 5.9 Cummins long blocks, 24 valve Cummins engines, and 12 valve Cummins long blocks.

What Makes a Cummins Engine Good for Towing?

The best towing engine depends on torque output, reliability, fuel delivery, and how well the engine handles sustained load. Diesel engines like Cummins are ideal for towing due to their high torque and durability.

12 Valve Cummins (1989-1998)

The 12 valve Cummins is known for its mechanical simplicity and reliability. It performs well for moderate towing but lacks the modern power and refinement of newer engines.

• Simple mechanical fuel system
• Highly reliable
• Best for lighter towing and older trucks

24 Valve Cummins (1998.5-2002)

The 24 valve Cummins introduced electronic fuel control with the VP44 injection pump. It offers improved performance over the 12 valve but still has limitations compared to newer engines.

• Better power than 12 valve
• VP44 fuel system
• Good for moderate towing

5.9 Cummins Common Rail (2003-2007)

The 5.9 Cummins common rail is one of the best all-around diesel engines. It combines strong towing capability with reliability and fewer emissions restrictions than newer platforms.

• Excellent reliability
• Strong towing performance
• Great balance of power and simplicity

6.7 Cummins (2007.5-2018)

The 6.7 Cummins offers the highest torque output and is the best option for heavy towing. It is designed for modern towing demands and performs best under load.

• Highest torque output
• Best for heavy towing
• Modern diesel platform

Best Cummins Engine for Towing: Final Comparison

Final Thoughts: Which Cummins Engine Is Best for Towing?

The best Cummins engine for towing depends on your needs. For maximum towing power, the 6.7 Cummins is the top choice. For a balance of reliability and performance, the 5.9 Cummins is one of the best all-around options.

CPP Diesel offers a full selection of Cummins engines for sale, including long block engines built for towing, performance, and reliability.

If you're looking for a Cummins engine for sale, one of the most common questions is whether the 5.9 Cummins or the 6.7 Cummins is the better choice. Both engines are proven platforms, but each has its strengths depending on your goals.

This Cummins engine comparison breaks down the key differences between the 5.9 and 6.7 Cummins to help you choose the right engine for your truck, whether you're focused on towing, performance, or long-term reliability.

If you're ready to upgrade or replace your engine, browse our full selection of 6.7 Cummins long block engines for sale and 5.9 Cummins long block engines.

Whether you're replacing a failed engine, upgrading for towing, or building a high-performance diesel truck, understanding the differences between the 5.9 and 6.7 Cummins can help you make the right decision.

Overview of the 5.9 Cummins Engine

The 5.9 Cummins engine was produced from 1989 to 2007, with the 2003–2007 common rail version being one of the most popular diesel engines ever built. Known for its durability and simplicity, the 5.9 is a favorite for both daily drivers and performance builds.

If you're considering a replacement, check out our 5.9 Cummins long block engines for sale.

Overview of the 6.7 Cummins Engine

The 6.7 Cummins engine replaced the 5.9 in 2007.5 and offers more displacement, improved torque, and better towing capability. It is commonly found in newer Dodge Ram 2500 and 3500 trucks.

Browse available options here: 6.7 Cummins long block engines for sale.

5.9 Cummins vs 6.7 Cummins: Key Differences

Which Cummins Engine Is Better for Towing?

For towing, the 6.7 Cummins generally has the advantage due to its increased displacement and higher torque output. It is designed for heavier loads and modern towing demands.

However, a properly built 5.9 Cummins long block can still perform extremely well for towing applications, especially when upgraded with the right supporting components.

Which Engine Is Better for Performance?

The 5.9 Cummins is often preferred for high-performance builds due to its simplicity and fewer emissions components. It is easier to modify and can handle high horsepower with the right setup.

The 6.7 Cummins also has strong performance potential, especially with modern tuning and turbo upgrades, but requires more supporting modifications.

Which Cummins Engine Should You Choose?

Choosing between the 5.9 and 6.7 Cummins comes down to your goals:

• Choose 5.9 Cummins for simplicity, reliability, and performance builds
• Choose 6.7 Cummins for towing, newer trucks, and higher torque output

Shop Cummins Engines for Sale

CPP Diesel offers a full selection of Cummins engines for sale, including long block engines for all major platforms.

• 12 Valve Cummins Long Blocks
• 24 Valve Cummins Long Blocks
• 5.9 Cummins Long Blocks
• 6.7 Cummins Long Blocks

If you need help choosing the right engine, contact CPP Diesel for expert guidance based on your build goals.

Why Choose MBRP Exhaust Systems?

MBRP has established itself as a leader in the performance exhaust market, offering a range of benefits:

• Increased Performance: MBRP exhausts are designed to maximize exhaust flow, reducing backpressure and allowing your engine to breathe more freely. This results in noticeable gains in horsepower and torque, enhancing acceleration and towing capabilities.

• Aggressive Sound: Choose from various sound profiles—from a deep, throaty rumble to a race-inspired roar. MBRP systems are tuned to provide the perfect exhaust note that matches your driving style.

• Improved Fuel Efficiency: By reducing engine strain and optimizing exhaust flow, MBRP exhaust systems can contribute to better fuel economy, saving you money at the pump.

• Durability: Constructed from high-quality materials like aluminized steel and T409 stainless steel, MBRP exhausts are built to withstand harsh conditions and resist corrosion, ensuring longevity.

• Easy Installation: Many MBRP systems are designed as direct bolt-on replacements, making installation straightforward with common hand tools.

MBRP Exhaust Series Overview

MBRP offers several exhaust series to cater to different performance needs and budgets:

• Installer Series: Made from heavy-gauge aluminized steel, this entry-level series offers excellent value without compromising on performance. It's ideal for those seeking a budget-friendly upgrade.

• Pro Series: Constructed from T409 stainless steel, the Pro Series provides enhanced durability and a polished finish. It's perfect for drivers looking for long-lasting performance and a sleek appearance.

• XP Series: Featuring T409 stainless steel with a matte black finish, the XP Series delivers a rugged look and robust performance. It's designed for those who demand both style and substance.

Customer Reviews and Feedback

MBRP exhaust systems have received positive reviews from enthusiasts and everyday drivers alike. Users praise the systems for their noticeable performance gains, aggressive sound, and quality construction. Many appreciate the straightforward installation process and the value MBRP provides compared to other aftermarket exhaust brands.

Conclusion

Upgrading to an MBRP Exhaust System is a smart investment for anyone looking to enhance their vehicle's performance, sound, and aesthetics. With a variety of options to choose from, MBRP ensures there's a system that fits your specific needs and preferences.

Explore our selection of MBRP Exhaust Systems and take the first step towards transforming your driving experience.

If you’re searching for the best place online to buy ATI fuel tanks, look no further than CPP Diesel’s ATI hub. We stock the full line of Aluminum Tank Industries (ATI) products, from auxiliary diesel tanks to DOT-approved refueling tanks, toolbox combos, split designs, wedge tanks, and the ultra-tough Severe Series. Our mission is to make CPP Diesel the central authority and #1 Google destination for everything ATI.

What Makes ATI Tanks Different?

ATI (Aluminum Tank Industries) is known for its precision-built tanks made from thick, high-quality aluminum. Every tank is fully baffled to reduce slosh, pressure and leak-tested, and engineered for long service life. With ATI, you can count on:

• DOT-compliance: ATI refueling tanks are built under a special DOT permit, making them legal for fueling equipment in the field.
• Versatility: Choose between refueling and auxiliary tanks depending on your needs.
• Fitment options: L-shape models designed to fit beneath crossover toolboxes, rectangle tanks for maximum capacity, wedge tanks for fifth-wheel clearance, and split tanks for carrying multiple fuels.

ATI Standard Tanks vs. ATI Severe Series Tanks

One of the most common questions we hear from diesel owners is: “Should I buy a standard ATI tank or a Severe Series tank?” Here’s the breakdown:

ATI Standard Tanks

• Constructed from .125" aluminum (1/8” thick).
• Lightweight yet durable for daily use in farm, fleet, and contractor applications.
• Available in all core shapes: L-shaped, rectangle, wedge, split, and toolbox combos.
• Cost-effective solution for most truck owners.

ATI Severe Series Tanks

• Built from .190" aluminum (50% thicker material than standard).
• Extra strength for extreme-duty applications like oilfield service, off-road fleets, mining, and heavy construction.
• Available in popular shapes like L-shaped and rectangle, as well as toolbox combos.
• Longer service life under harsh conditions; ideal if your tank sees daily abuse.

Key takeaway: If you want the toughest, longest-lasting tank on the market, the ATI Severe Series is your best choice. For general farm, fleet, and personal use, ATI’s standard .125" aluminum line gets the job done at a lower cost.

Shop by ATI Tank Style

CPP Diesel organizes ATI tanks by style to make it easy for you to find the right fit for your truck:

• L-Shaped Tanks (TTL) – tuck under crossover toolboxes.
• Rectangle Tanks (TTR) – max capacity in compact footprints.
• Wedge Tanks (TTW) – ideal for 5th-wheel/gooseneck clearance.
• Split Tanks – carry two liquids in one tank.
• Tank + Toolbox Combos – fuel storage plus secure gear storage.
• Auxiliary Tanks (AUX) – gravity-feed your factory tank with Fuel Shotz kits.
• Severe Series – heavy-duty .190" aluminum for extreme use.

Why Buy ATI Tanks from CPP Diesel?

When you shop at CPP Diesel’s ATI hub, you’re getting more than just a tank. You’re gaining access to:

• Full product lineup: Every ATI tank style and size, all in one place.
• Expert guidance: Our team helps you choose between auxiliary vs. refueling, or standard vs. Severe Series.
• Internal resources: Each tank page includes dimensions, fitment, and FAQs tailored for diesel truck owners.
• Competitive pricing: We track market prices to deliver great value.

Frequently Asked Questions About ATI Tanks

Are ATI tanks DOT approved?

Yes. ATI refueling tanks are built under DOT special permits for legal dispensing of fuel. Auxiliary tanks are DOT-compliant for feeding the truck’s own tank.

What’s the difference between auxiliary and refueling tanks?

Auxiliary tanks connect to your factory filler neck (via Fuel Shotz kit), keeping your OEM tank full until the aux tank empties. Refueling tanks allow you to fuel equipment directly in the field.

Do ATI tanks fit with toolboxes?

ATI’s L-shaped tanks are specifically designed to fit beneath crossover/chest toolboxes, making them a popular choice for contractors and farmers.

Why choose Severe Series over standard?

If you work in extreme-duty environments—construction, mining, oilfield—the Severe Series with .190" aluminum provides the extra toughness and lifespan you need. Standard .125" tanks are perfect for general work and personal trucks.

Ready to upgrade? Visit the ATI Fuel Tank Category at CPP Diesel to browse every size, shape, and style. With the largest selection and detailed product pages, CPP Diesel is your #1 source for ATI fuel tanks.

One of our standout solutions is the CPP Takeout Engines – complete, remanufactured 12-valve Cummins engines for fast, hassle-free conversions. These engines are perfect for anyone looking to upgrade their truck without rebuilding from scratch.

Our Cummins conversion parts include:

Conversion Kits by Engine Year:

• 1989–1993 Dodge Ram 5.9L – All-in-one conversion components for classic 12-valve engines

• 1994–1998 Dodge Ram 5.9L – Upgrade pumps, injectors, and fuel system components

• 1998–2002 Dodge Ram 5.9L – Performance injection upgrades and gasket sets

• 2003–2007 Dodge Ram 5.9L – Hot Street & Competition Series P7100 pumps, Howler VGT kits, and more

• 2007.5–2012 Dodge Ram 6.7L – High-flow injectors, intake kits, and turbo upgrades

• 2013–2018 Dodge Ram 6.7L – Fuel system components, injectors, and CPP takeout engine conversions

• 2019–2024 Dodge Ram 6.7L – Modern upgrades, emission-compliant kits, and performance injection systems

Popular Components:

• Injection Pumps & Components – P7100, VP44, VE, CP3 pumps and all associated components

• Fuel Injectors – SAC & VCO nozzle injectors for optimal power and efficiency

• Fuel System Accessories – Lift pumps, filters, gaskets, and fittings

• Intake & Turbo Upgrades – Emissions-compliant intake kits and high-flow turbo kits for performance

With CPP Diesel conversion parts, you’ll experience:

• Durable, high-quality components built to last

• Simplified conversions with our complete 12-valve takeout engines

• Optimized performance for street, towing, or racing applications

Shop by Product Type:

• CPP Takeout Engines

• Pumps & Injectors

• Fuel System Components

• Intake & Turbo Kits

For every Dodge Ram model year and engine type, CPP Diesel has the parts and complete engines you need to ensure your conversion is reliable, efficient, and high-performing.

FAQ

Q: What is a CPP Takeout Engine?
A: A complete 12-valve Cummins engine, remanufactured and ready to install, perfect for fast, reliable conversions.

Q: Are these conversion parts compatible with my Dodge Ram model?
A: Our parts support 1989–2024 Dodge Ram 5.9L and 6.7L Cummins engines. Verify your year/model for exact fitment.

Q: Why choose SAC injectors or high-performance pumps?
A: They offer higher fuel flow, consistent spray patterns, and improved reliability over stock components.

Q: Can I mix components from different conversion kits?
A: Yes, but check compatibility for your specific engine. Our team can help ensure the right combination.

Q: Are these upgrades emissions-compliant?
A: Many of our intake and turbo upgrades meet emissions standards while enhancing performance.

The Hot Street P7100 12mm pump is precision-built for high-performance street and light-duty racing applications. Engineered with upgraded components, this pump provides consistent fuel delivery for stronger throttle response, increased horsepower, and a smooth idle.

For those looking to push the limits, the Competition Series P7100 pump takes performance even further. With advanced internal upgrades and hardened components, it’s built to handle high boost and extreme fuel demands while maintaining durability for the toughest conditions.

Both pump series are designed to meet the exacting standards of CPP Diesel, giving you a reliable upgrade over stock P7100 pumps while improving overall engine performance. These pumps are ideal for Dodge Cummins 5.9L engines, particularly for 12mm injector setups.

Shop P7100 Pump Options:

• CPP Diesel Hot Street P7100 12mm Pump

• CPP Diesel Competition Series P7100 Pump

FAQ

Q: What is a P7100 injection pump?
A: The P7100 injection pump is a high-pressure mechanical fuel pump used on Dodge Cummins 5.9L engines, designed to deliver precise fuel timing and flow to the injectors.

Q: What’s the difference between Hot Street and Competition Series P7100 pumps?
A: Hot Street pumps are optimized for street performance and light racing, while Competition Series pumps are built for maximum performance, high boost, and heavy-duty applications.

Q: Can I use these pumps with stock injectors?
A: Yes, but performance improvements are most noticeable with upgraded injectors, particularly 12mm setups.

Q: Are these pumps direct replacements?
A: Yes, both Hot Street and Competition Series P7100 pumps are designed as direct replacements for stock P7100 units.

Q: How do I maintain a P7100 pump?
A: Regular fuel filter changes, clean diesel, and proper lubrication are essential. CPP Diesel pumps are built for durability but proper maintenance ensures longevity.

BD Diesel Howler VGT Turbo Kit for 03-07 Dodge Cummins

The BD Diesel Howler VGT Turbo Kit is a top-tier upgrade for your 2003-2007 Dodge Ram 5.9L Cummins. Designed for enthusiasts seeking better spool, increased torque, and improved top-end power, this turbo kit uses advanced Variable Geometry Turbo (VGT) technology to adapt boost to your driving conditions.

How the Howler VGT Works

Unlike standard fixed-geometry turbos, a VGT turbo has adjustable vanes in the turbine housing. These vanes change angle based on engine RPM and load, delivering:

• Faster spool at low RPM: More torque and quicker response.
• Improved top-end power: Sustained boost for high RPM performance.
• Better efficiency: Reduced stress on engine and turbo, longer lifespan.

How the BD Diesel Howler VGT Turbo Works: A Technical Look

The Variable Geometry Turbo (VGT) in the BD Diesel Howler kit is what sets it apart from traditional fixed-geometry turbos. Unlike standard turbos, which have a single turbine housing and fixed vanes, a VGT turbo has adjustable vanes inside the turbine housing. These vanes can change their angle depending on engine speed and load, which gives your Cummins several key advantages:

1. Faster Spool at Low RPM:
   At low engine speeds, the vanes close slightly, narrowing the exhaust path. This increases exhaust gas velocity and spins the turbo faster, giving your engine quick boost and more torque without lag.

2. Improved Top-End Power:
   At higher RPMs, the vanes open up to allow more exhaust flow. This prevents restriction and maximizes airflow for higher horsepower and sustained performance, perfect for towing or performance driving.

3. Better Efficiency & Longevity:
   Because the turbo adapts to your driving conditions, it reduces stress on the engine and turbo components, extending their life and maintaining consistent boost pressure.

4. Why It Beats Traditional Fixed Turbos:
   Fixed-geometry turbos are optimized for a specific RPM range. Outside that range, performance drops. The Howler VGT turbo continuously adapts, giving your 5.9L Dodge Cummins smooth, responsive power across the entire RPM band.

Installation Tips & Kit Options:
For enthusiasts installing the BD Diesel Howler VGT Turbo on a 03–07 Cummins, the install kit includes all necessary hardware for a proper setup. This ensures the turbo is mounted securely, the exhaust and intake components are aligned, and your engine is ready to handle the improved airflow and boost.

BD Diesel Howler VGT Turbo Installation

The kit comes with an optional install kit to ensure a proper fit and alignment for your 5.9L Cummins. Whether you’re towing, hauling, or boosting performance, correct installation is critical for maximum turbo efficiency and longevity.

Shop the BD Diesel Howler VGT Turbo Kits

• BD Diesel 1047140 Howler VGT Turbo Kit
• BD Diesel Howler VGT Install Kit

If you own a 2007-2018 Dodge Ram with a 6.7L Cummins engine, the stock grid heater bolt is a hidden risk that can cause catastrophic engine damage. CPP Diesel’s Grid Heater Upgrade Kit with High-Flow Intake solves this problem while improving airflow, engine efficiency, and long-term reliability.

Why the Stock Grid Heater Bolt is Dangerous

The infamous “killer grid heater bolt” on 6.7L Cummins engines can snap or fail under normal operating conditions, leading to oil leaks, coolant contamination, or even complete engine failure. Thousands of Ram owners have faced costly repairs due to this single weak point.

CPP Grid Heater Upgrade Kit: Reliability and Performance

CPP Diesel engineered a direct replacement grid heater bolt upgrade that eliminates the risk of failure. Our kit includes:

• Custom Grid Heater Delete Plate for improved flow without restriction
• High-flow intake components to improve air delivery
• Race Ready intake kit with no grid heater restriction and our custom thread in heater

Installing this kit ensures your 6.7L Cummins runs safely, efficiently, and longer without the threat of catastrophic grid heater failure.

Other Solutions and Compatible Kits

For owners who want additional protection, the BD Diesel 1041520 Killer Grid Heater Upgrade Kit also addresses the grid heater bolt issue. CPP’s kit offers the added advantage of high-flow intake optimization, combining protection with performance gains.

Emissions-Compliant Intake Kit

CPP also has an intake kit designed to be fully emissions compliant while providing superior airflow. This upgrade supports safer, more efficient engine operation without violating EPA regulations, making it perfect for daily drivers and fleet vehicles.

Choose your year/model below.....

BANKS 42797 MONSTER RAM INTAKE SYSTEM FOR 07.5-12 CUMMINS 6.7L 24V

BANKS 42798 MONSTER RAM INTAKE SYSTEM FOR 13-18 CUMMINS 6.7L 24V

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Protect Your Engine and Upgrade Performance

Don’t risk a failed grid heater bolt ruining your 6.7L Cummins. CPP Diesel’s Grid Heater Upgrade Kit with High-Flow Intake offers unmatched protection, performance gains, and emissions compliance. Upgrade today to keep your Dodge Ram running strong and reliable.

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If you’re looking for high-performance, reliable Cummins engines for Dodge Ram trucks from 1989 to 2024, CPP Diesel has you covered. Our selection of remanufactured Cummins engines includes crate engines, long blocks, and short blocks for a variety of Dodge Ram models, all designed to deliver maximum performance and durability.

What Are Crate Engines?

Crate engines are fully remanufactured engines shipped in a crate, ready for installation. At CPP Diesel, our crate engines undergo rigorous testing and blueprinting to ensure peak performance, extended engine life, and reliability under demanding conditions. These engines are ideal for truck owners looking for a turn-key upgrade that maintains OEM standards while providing enhanced capabilities.

Long Blocks vs Short Blocks

Understanding the difference between long blocks and short blocks is crucial for selecting the right engine for your project:

• Long Block: Includes the engine block, cylinder head, camshaft, valvetrain, and sometimes other components. Long blocks provide a more complete engine solution for remanufacturing or performance builds.
• Short Block: Contains only the engine block, crankshaft, rods, and pistons. Short blocks are ideal for rebuilding existing heads or upgrading internal components while maintaining OEM performance.

What Does “Blueprinting” an Engine Mean?

Blueprinting is a precision process used during engine remanufacturing to ensure every component meets exact specifications. At CPP Diesel, our blueprinting process includes:

• Inspecting and resizing cylinders for perfect alignment and clearances
• Balancing crankshafts, rods, and pistons for smoother operation
• Ensuring proper torque and tolerances on all components

This meticulous process improves engine efficiency, power output, and longevity, giving you confidence in every CPP Diesel engine you install.

CPP Diesel Engine Options

Our inventory covers a full range of Cummins engines for Dodge Ram trucks, including:

• 1989–1993 5.9L Cummins Crate Engines
• 1994-1998 5.9L Cummins Crate Engines
• 1998.5–2002 5.9L Cummins Long and Short Blocks
• 2003–2007 5.9L Cummins High-Performance Options
• 2007–2018 6.7L Cummins Engine Upgrades
• 2018–2024 6.7L Cummins Reman and Performance Options

Why Choose CPP Diesel Engines?

Each CPP Diesel engine is built to exacting standards, ensuring long-term reliability and performance. Whether you are installing a crate engine, long block, or short block, CPP Diesel ensures your engine is blueprint-verified and ready to perform from day one.

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Long-Tail Tags for SEO

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S&S Diesel 6.7L DCR CP4-to-DCR Conversion Kit for 2011-2022 Powerstroke

Enhance the performance and reliability of your 2011-2022 Powerstroke 6.7L engine with the S&S Diesel 6.7L DCR CP4-to-DCR Conversion Kit. This kit replaces the factory CP4 pump with the robust and dependable DCR pump, offering improved fuel delivery, smoother operation, and increased durability for high-demand diesel applications.

Why Upgrade to a DCR Pump?

The DCR pump provides a modern solution for drivers seeking reliable fuel system performance. Key benefits include:

• Enhanced fuel system durability under high boost and heavy loads
• Smoother engine operation and reduced risk of fuel pump failure
• Support for increased horsepower and torque in tuned engines
• Optimized compatibility with high-performance injectors and diesel tuning

New Components for Maximum Reliability

The S&S Diesel DCR CP4-to-DCR Conversion Kit features all-new components, ensuring you get a fresh, high-quality setup rather than a remanufactured system. Proper installation guarantees:

• Consistent fuel flow and pressure
• Long-lasting reliability for your diesel engine
• Support for upgrades like high-performance injectors

Perfect for High-Performance Builds

If you’re upgrading your injectors or tuning your truck for more horsepower and torque, this DCR conversion kit ensures your fuel system can handle the demand. Pair it with high-performance diesel injectors for optimal results and long-term engine reliability.

Long Tail Keywords & SEO Optimization

Target search phrases include: S&S Diesel 6.7L DCR kit installation, CP4-to-DCR Powerstroke conversion, Ford 6.7L diesel DCR upgrade, DCR pump replacement 2011-2022, 6.7L diesel performance upgrade, CPP Diesel S&S DCR kit, increase 6.7L horsepower, Powerstroke 6.7L fuel system upgrade.

Frequently Asked Questions (FAQ)

Do I need a tuner after installing the DCR conversion kit?

No tuner is required for installation, but a performance tune is recommended to unlock full horsepower and torque potential.

Is this kit compatible with all 2011-2022 6.7L Powerstroke engines?

Yes, it is designed for all CP4-equipped 6.7L Powerstroke engines produced from 2011 to 2022.

Does the kit include installation instructions?

Yes, detailed installation instructions are included to ensure proper setup of the DCR pump and components.

Can I reuse my existing CP4 pump?

No, the CP4 pump is fully replaced by the DCR pump for improved fuel system reliability and performance.

Upgrade your 6.7L Powerstroke with the S&S Diesel DCR CP4-to-DCR Conversion Kit for long-lasting reliability and enhanced diesel performance.