EXHAUST SYSTEM AND COMPONENTS
EXHAUST SYSTEM AND COMPONENTS — 03–07 DODGE RAM 5.9L CUMMINS
Unlock flow, lower EGTs, and dial in the sound you want on your 2003–2007 Ram 2500/3500 5.9L Cummins. CPP Diesel stocks proven 4"/5" cat-back systems, downpipes, exhaust manifolds, clamps, and mufflers—plus exhaust brakes for confident towing.
DODGE CUMMINS › 03–07 5.9L CUMMINS › EXHAUST SYSTEM AND COMPONENTS
Shop the full 03–07 EXHAUST category
Shop by System
- Cat-Back Systems (’04.5–’07)
Diamond Eye K4234A — 4" Cat-Back w/ Muffler (04.5–07.5) • Diamond Eye K4234A-RP — 4" Cat-Back, No Muffler (04.5–07.5) • MBRP S6108AL — 4" Cat-Back (04.5–07) - Downpipes & First Sections
HE351 Downpipes & Related (03–07) • Diamond Eye 221064 — 4" First Section (03–Early ’07) - Exhaust Manifolds (T3/T4)
BD Diesel 1046087 Pulse Manifold (03–07) • ATS 204-920-2272 Pulse Flow T3 (03–07) • Browse All 03–07 Manifolds & Hardware - Clamps, V-Bands & Hardware
Diamond Eye 444000 — 4" U-Bolt Clamp • Diamond Eye L40SA — 4" Torca Lap-Joint • PPE 517140000 — 4" Quick-Release V-Band • PPE 517340000 — 4" Stainless V-Band • Mishimoto MMCLAMP-VA-4 — 4" V-Band - Mufflers & Resonators
Diesel Mufflers, Resonators & Deletes - Exhaust Brakes (Towing)
Pacbrake C44047 — PRXB Inline Kit (03–07) • Pacbrake C20141 — ECM Bypass (03–07)
Why Buy Exhaust Parts from CPP Diesel?
- 03–07 focused fitment: Hand-picked systems and components that fit the 5.9L CR platform.
- Top brands, real support: Diamond Eye, MBRP, BD, ATS, PPE, Mishimoto, Pacbrake—backed by diesel techs.
- Use-case guidance: Towing, daily, or track—we help match pipe size, muffler choice, and hardware.
Frequently Asked Questions
What’s the difference between 2003–2004 and 2004.5–2007 systems?
Early ’03–’04 trucks use different turbo-back layouts and muffler sizing. Many cat-back kits are labeled for 04.5–07. Always match the year range listed on the product page.
4" vs 5"—which size should I choose?
4" is a great all-around upgrade for stock to mild builds. 5" can reduce restriction further and change tone, often chosen for larger tunes/turbos. Ensure tip and hanger clearance.
Are these parts emissions compliant?
Choose systems that are designed for your model year and local regulations. Always follow the product’s compliance notes and applicable laws.
Do I need an exhaust brake for towing?
On heavy grades with big trailers, a PRXB-style brake adds control and reduces service brake wear. See our Pacbrake kits above for 03–07 applications.
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CLAMPS / ACCESSORIES
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DOWNPIPES
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EXHAUST ADAPTERS
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EXHAUST BRAKES
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EXHAUST ELBOWS
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EXHAUST MANIFOLDS
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EXHAUST SYSTEM
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EXHAUST TIPS
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MUFFLERS
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MUFFLER DELETES / TUBING
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SPLITTERS
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STACKS / COMPONENTS
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TAILPIPES
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DIAMOND EYE 150100 UNIVERSAL STACK KIT 5 INCH ALUMINIZED PERFORMANCE SERIES DIESEL EXHAUST KIT
DIAMOND EYE PERFORMANCE
$902.74Universal Stack Kit 5 Inch Aluminized Performance Series Diesel Exhaust Kit. Diamond Eye Manufacturing, the worlds toughest Diesel and Gas Exhaust, is recognized as being one of the most modern and progressive companies in eastern Oregon. Our Exhaust...$902.74 -
DIAMOND EYE K4234A CAT BACK EXHAUST SYSTEM FOR 04.5-07.5 DODGE RAM 2500/3500 4 INCH SINGLE SIDE WITH MUFFLER ALUMINIZED
DIAMOND EYE PERFORMANCE
$736.78Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$736.78 -
DIAMOND EYE K4234S CAT BACK EXHAUST SYSTEM FOR 04.5-07.5 DODGE RAM 2500/3500 5.9L CUMMINS 4 INCH PASS WITH MUFFLER STAINLESS
DIAMOND EYE PERFORMANCE
$879.39Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$879.39 -
DIAMOND EYE K4234S-RP CAT BACK EXHAUST SYSTEM FOR 04.5-07.5 DODGE RAM 2500/3500 5.9L CUMMINS 4 INCHPASSEXIT NO MUFFLER STAINLESS
DIAMOND EYE PERFORMANCE
$763.86Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$763.86 -
DIAMOND EYE K4236A-RP CAT BACK EXHAUST SYSTEM FOR 04.5-07.5 DODGE RAM 2500/3500 CUMMINS 4 INCH SPLIT SIDE NO MUFFLER ALUMINIZED
DIAMOND EYE PERFORMANCE
$879.59Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$879.59 -
DIAMOND EYE K5244A CAT BACK EXHAUST SYSTEM 04.5-07.5 DODGE RAM 2500/3500 5 INCH SINGLE/DUAL WITH MUFFLER SPLIT SIDE ALUMINIZED
DIAMOND EYE PERFORMANCE
$879.39Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$879.39 -
DIAMOND EYE K5244A-RP CAT BACK EXHAUST SYSTEM 04.5-07.5 DODGE RAM 2500/3500 5 INCH SINGLE/DUAL NO MUFFLER SPLIT SIDE ALUMINIZED
DIAMOND EYE PERFORMANCE
$763.86Transforming your truck's performance with the Cat Back Exhaust System from Diamond Eye Manufacturing. This high-quality exhaust system isn't just a purchase; it's a game-changer for drivers who demand enhanced power, efficiency, and sound from their...$763.86 -
BD DIESEL 1046087 PULSE 5.9L CUMMINS EXHAUST MANIFOLD KIT DODGE 2003-2007 2500/3500
BD DIESEL
$716.95This is the perfect drop-in replacement. The fully divided pulse Manifold, made from high-silicon ductile iron, is designed to withstand extreme temperatures and vibration. It is designed using modern technology to ensure optimal internal geometry...$716.95 -
AFE 49-42005 LARGE BORE-HD 4" 409 STAINLESS STEEL CAT-BACK EXHAUST SYSTEM FOR 03-04 CUMMINS 5.9L
AFE POWER
$712.00The AFE 49-42005 Large Bore-HD 4" 409 Stainless Steel Cat-Back Exhaust System is a sophisticated upgrade designed specifically for Dodge Diesel Trucks from 2003 to 2004 equipped with the robust L6-5.9L Cummins engine. Crafted from mandrel bent 4" 409...$712.00 -
AFE 49-42012 LARGE BORE-HD 5" 409 STAINLESS STEEL CAT-BACK EXHAUST SYSTEM FOR 04.5-07 CUMMINS 5.9L
AFE POWER
$865.00The AFE 49-42012 Large Bore-HD 5" Cat-Back Exhaust System is a remarkable upgrade for Dodge diesel trucks, specifically designed for the 2004.5 to 2007 L6-5.9L models. Crafted from 5" mandrel-bent 409 stainless steel tubing, this exhaust system ensures...$865.00 -
BANKS 48640-B MONSTER EXHAUST SYSTEM 4IN SINGLE EXIT-BLACK ROUND TIP -SCLB/CCSB (WITH CATALYTIC CONVERTER) FOR 03-04 DODGE 5.9L 24V
BANKS
$769.004-inch constant-diameter system flows up to 122 Percent better than stock. Turbo Back System with 5-inch Cerakote Black tip. The 4 inch Monster exhaust system flows up to 122 percent better than stock and virtually eliminates backpressure. Banks...$769.00 -
MBRP S61140PLM 5 " TURBO BACK SINGLE SIDE EXIT FOR 2003-2004 DODGE RAM WITH 5.9L CUMMINS ENGINE
MBRP
$679.99Product Description:The MBRP S61140PLM 2003-2004 2500 3500 Cummins Aluminized Steel 5 Turbo Back Single Side Exit is the ultimate exhaust system for diesel truck enthusiasts. Crafted from heavy-duty aluminized steel, the PLM Series offers premium quality...$679.99 -
MBRP S61140P 5 " TURBO BACK SINGLE SIDE EXIT FOR 03-04 DODGE RAM WITH 5.9L CUMMINS ENGINE
MBRP
$749.99MBRP S61140P 2003-2004 2500 3500 CUMMINS ALUMINIZED STEEL 5 TURBO BACK SINGLE SIDE EXIT delivers exceptional performance and quality for your Truck's exhaust system needs. Crafted from heavy-duty Aluminized Steel, the Performance Series offers top-notch...$749.99 -
MBRP S6104409 4 " TURBO BACK SINGLE SIDE T409 STAINLESS STEEL FOR 2003-2004 DODGE RAM 4WD WITH 5.9L CUMMINS ENGINE
MBRP
$794.99The MBRP S6104409 Turbo Back Exhaust System is designed for specific 2003-2004 Dodge Ram 2500/3500 Cummins 5.9L 305HP models, ensuring a perfect fit for 4WD vehicles. Constructed from durable T409 stainless steel, this 4-inch single side exhaust system...$794.99 -
MBRP S61140AL ALUMINIZED 5 " TURBO BACK EXHAUST FOR 2003-2004 DODGE RAM WITH 5.9L CUMMINS ENGINE
MBRP
$784.99The MBRP S61140AL 2003-2004 Dodge Ram 2500/3500 Cummins Aluminized Steel 5 Inch Turbo Back Single Side Exit exhaust system is built to provide your truck with optimal performance and durability. Constructed from heavy-duty Aluminized Steel, this...$784.99 -
PACBRAKE HP10164-AL ONBOARD AIR KIT WITH 2 1/2 GALLON ALUMINUM AIR TANK W/AIR COMPRESSOR
PACBRAKE
$709.85The PACBRAKE HP10164-AL Onboard Air Kit with its 2 1/2 Gallon Aluminum Air Tank and Air Compressor is meticulously designed to meet the diverse air supply demands of enthusiasts and professionals alike. This all-in-one kit is not just about convenience;...$709.85 -
PACBRAKE C40110 DIRECTMOUNT 4 INCH PRXB HP EXHAUST BRAKE ONLY FOR 03-04 DODGE RAM WITH 5.9 CUMMINS ENGINE
PACBRAKE
$659.51The Pacbrake C40110 Direct Mount 4 Inch PRXB High Performance Exhaust Brake transforms your 2003-2004 Dodge RAM equipped with the Cummins 5.9L ISB 24 Valve engine. Specifically designed for optimal compatibility with both Standard and 47RE/48RE Automatic...$659.51 -
PACBRAKE C44031 DIRECTMOUNT 4 INCH PRXB HP EXHAUST BRAKE FOR 03-04.5 DODGE RAM WITH 5.9 CUMMINS ENGINE (MANUAL)
PACBRAKE
$861.41The PACBRAKE C44031 Direct Mount 4 Inch PRXB High Performance Exhaust Brake is an advanced solution meticulously engineered for the Dodge RAM 2003-2004.5 equipped with a Cummins 5.9L ISB 24 Valve standard transmission. Perfectly designed to significantly...$861.41 -
PACBRAKE HP10164 ONBOARD AIR WITH 2 1/2 GALLON AIR TANK W/AIR COMPRESSOR
PACBRAKE
$682.02The PACBRAKE HP10164 Onboard Air Kit with a 2 1/2 Gallon Air Tank is the ultimate solution for all your portable air needs. Designed to ensure you stay fully equipped, this robust kit is perfect for use on the road or off the beaten path. Easily access...$682.02 -
AFE POWER 46-40011 BLADERUNNER 409 STAINLESS STEEL EXHAUST MANIFOLD FOR 03-07 CUMMINS 5.9L
AFE POWER
$816.27The AFE Power 46-40011 BladeRunner 409 Stainless Steel Exhaust Manifold elevates the performance of 2003-2007 Dodge Diesel trucks equipped with the L6-5.9L Cummins engine. Designed to eliminate the common crack issues found in factory exhaust manifolds,...$816.27 -
PACBRAKE C44037 DIRECT MOUNT 4 INCH PRXB HP EXHAUST BRAKE KIT FOR 04.5-07 DODGE RAM WITH 5.9 CUMMINS ENGINE (MANUAL) | 06-07 (AUTO)
PACBRAKE
$861.41Enhance your Dodge RAM's braking performance with the Pacbrake C44037 Direct Mount 4 Inch PRXB High Performance Exhaust Brake Kit. Specifically designed for the 2004.5-2007 Cummins 5.9L ISB 24 Valve and the 2006-2007 Cummins 5.9L 24 Valve Engine, this...$861.41 -
PACBRAKE HP10628 12V HP625 SERIES AIR COMPRESSOR KIT WITH HORIZONTAL PUMP HEAD
PACBRAKE
$872.27The PACBRAKE HP10628 12V HP625 Series Air Compressor Kit with Horizontal Pump Head delivers robust performance paired with versatility, making it an essential addition for anyone in need of reliable inflation power. Engineered to handle demanding tasks,...$872.27 -
PACBRAKE HP10629 12V HP625 SERIES PREMIUM AIR COMPRESSOR WITH VERTICAL PUMP HEAD
PACBRAKE
$856.10The PACBRAKE HP10629 12V HP625 Series Premium Air Compressor with Vertical Pump Head is the ultimate solution for anyone seeking powerful and reliable inflation capabilities. Engineered for durability and exceptional performance, this air compressor...$856.10