Product Description
Make big power with precision. The Exergy E01 10254 Reman 250% Over Injector Set is engineered for high-horsepower 2004.5–2005 Duramax LLY builds that demand maximum fuel delivery with repeatable control. Each set is remanufactured, balanced, and flow-matched by Exergy Performance for consistent cylinder-to-cylinder fueling at elevated flow rates.
Who Is This For?
- Serious performance builds (competition, compounds, large single turbos)
- Trucks with appropriate air, fuel supply, and tuning
- Not recommended for stock or mild street setups
Key Features
- Approx. 250% over flow vs. stock LLY injectors
- Remanufactured, balanced, and flow-verified by Exergy
- Tight balance rates for smooth running at big power
- Designed for use with upgraded CP3 and lift pump
Fitment
- Make/Model: Chevrolet Silverado 2500HD/3500HD; GMC Sierra 2500HD/3500HD
- Engine: 6.6L Duramax LLY
- Years: 2004.5, 2005 (LLY)
What’s Included
- (8) Exergy E01 10254 Reman 250% Over Injectors (LLY)
- Flow data sheet and balance information (typical)
Required / Recommended Supporting Parts
To support 250% over injectors, your fuel & air systems must be up to the task:
- Exergy E04 10205 Sportsman CP3 (LLY)
- Diesel Lift Pumps (AirDog / FASS)
- Injector Install Gaskets & Seals
- Shop All Exergy Performance
Tuning & Setup Notes
- Custom tuning is required. Large-flow injectors need proper calibration for power and drivability.
- Upgraded turbo(s) and adequate air supply are mandatory to manage EGTs.
- Use high-quality filtration and maintain clean fuel. Contamination is the #1 cause of injector failure.
Frequently Asked Questions
Q: Are these injectors streetable?
A: They are intended for high-performance/competition builds. Daily drivability depends on your supporting mods and tuning.
Q: Do I need an upgraded CP3 and a lift pump?
A: Yes. 250% over injectors require an upgraded CP3 and a quality lift pump to maintain supply pressure and reliability. See the Exergy CP3 and our lift pump options.
Q: Is there a core charge?
A: Many Exergy reman injector sets carry a refundable core charge. If applicable, details will appear in the product options or at checkout.
Q: Do I need new injector seals and return-line components?
A: We highly recommend new seals and related hardware during installation. See Gaskets & Seals.
Q: Warranty?
A: Covered by Exergy’s manufacturer warranty. Keep proof of purchase and follow correct installation, filtration, and tuning practices.
About Exergy Performance
Exergy is a leader in precision diesel fuel system components, known for rigorous testing and flow verification. Explore more Exergy components here: Exergy Performance at CPP Diesel.
