GM DURAMAX PARTS & UPGRADES

Shop performance and OE-grade replacement parts for every Duramax generation: LB7 (2001–2004), LLY (2004.5–2005), LBZ (2006–2007), LMM (2007.5–2010), LML (2011–2016), L5P (2017–2025). From intakes and turbos to fuel, cooling, and Allison transmission solutions—CPP Diesel curates parts that work as hard as your truck.

SHOP BY SUBCATEGORY

POPULAR FIXES & UPGRADES

FITMENT CHEAT SHEET

GENERATION	MODEL YEARS	COMMON UPGRADES
LB7	2001–2004	Injectors, air intake, exhaust, intercooler boots/tubes, monitoring
LLY	2004.5–2005	Cooling improvements, turbo mouthpiece/flow, exhaust, monitoring
LBZ	2006–2007	Intake/exhaust, turbo options, head studs for higher boost, tuning
LMM	2007.5–2010	DPF-safe airflow & cooling, intercooler piping, monitors
LML	2011–2016	CP4 risk mitigation/CP3 conversion, filtration, turbo & intercooler tubes
L5P	2017–2025	High-flow intake, intercooler piping, turbo upgrades, (competition) CP3 swap options

Tip: Confirm fitment by generation/year/VIN and product notes before ordering.

WHY CPP DIESEL

Trusted Brands: S&S Diesel, FASS, BD Diesel, Wehrli (WCFab), Banks, PPE, ARP, Mishimoto, AFE.
Real Diesel Help: Call 724-785-4022 for build planning and tech support.
Fast Fulfillment: Streamlined shipping on in-stock parts.
Clear Fitment: Detailed notes by generation and year.
Fair Pricing: Competitive pricing + frequent promos.

HELPFUL NOTES

LML CP4: Known for failure risk—use quality filtration and consider a CP3 conversion where appropriate.
L5P Fuel System: Uses a different high-pressure pump; competition-use CP3 swap kits exist—verify legality and tuning requirements.
Allison Care: Extra cooling, filtration, and quality rebuild components extend service life under heavy tow/haul.
Monitoring First: Add gauges or a digital monitor before heavy mods to protect EGT, boost, and trans temps.
Emissions: For on-road use, confirm CARB/EO compliance on each product page.

DURAMAX FAQ

Which parts fit my GM Duramax?

Match your generation (LB7, LLY, LBZ, LMM, LML, L5P) and read the fitment notes on each product page. We can confirm by VIN—just ask.

What are the best first upgrades?

Start with monitoring (gauges/OBD), a quality air intake, and a free-flowing exhaust. Then add platform-specific items like LML CP4 protection or intercooler piping.

Do I need a CP3 conversion?

CP3 conversions are common on LML trucks for reliability. L5P swaps exist for competition use—check product details and local regulations.

Are these parts 50-state legal?

Some are. Look for CARB/EO info on each product page or contact us for guidance.

Can you help me plan a build?

Yes—call our diesel team at 724-785-4022 with goals, budget, and VIN.

RELATED DIESEL CATEGORIES

CPP Diesel stocks GM Duramax parts for Silverado & Sierra HD (2001–2025) across all generations: LB7, LLY, LBZ, LMM, LML, and L5P. Shop proven upgrades and OE-level replacements: intakes, exhaust, intercoolers, injectors, turbos, fuel system (CP3/CP4), head studs, gaskets, sensors, and Allison transmission components. Whether you’re building towing reliability or chasing ETs, we curate top brands like S&S Diesel, FASS, BD Diesel, Wehrli (WCFab), Banks, PPE, ARP, and Mishimoto—backed by fast shipping, price match, and diesel-savvy support.