Product Description
Feed serious power goals on your LLY the right way with the Exergy E01 10252 Reman 200% Over Injector Set. Precision-calibrated by Exergy Performance and flow-matched as a complete set, these 200% overs deliver huge fueling capacity while maintaining clean balance rates and drivability when paired with proper air, fuel supply, and tuning.
Key Benefits
- Remanufactured, flow-verified, and set-matched by Exergy for consistency cylinder-to-cylinder
- ~200% over stock capable fueling for high horsepower builds and competition use
- Built to OEM quality standards with tight tolerances for reliable operation
- Ready for custom tuning; supports big singles or compound turbo setups
Fitment
- Make/Model: Chevrolet Silverado 2500HD/3500HD; GMC Sierra 2500HD/3500HD
- Engine: Duramax 6.6L LLY
- Years: 2004.5, 2005 (mid-year LLY introduction)
- Replaces factory LLY injectors; intended for off-road/competition applications where emissions compliance is not required
What’s Included
- (8) Exergy E01 10252 Reman 200% Over LLY Injectors – flow-matched set
- Individual test data/flow sheet (typical for Exergy sets)
Recommended Supporting Parts
To support 200% overs, plan the whole system—supply, high-pressure pump, air, and sealing hardware:
- Shop All Exergy Performance (match with Exergy fuel system components)
- Exergy E04 10205 Sportsman CP3 – LLY
- Lift Pumps (AirDog / FASS) – stabilize supply pressure and filtration
- Injector Install Gaskets & Seals
Install Notes
- Professional installation and custom tuning are required for 200% overs.
- Prime/bleed the fuel system thoroughly; contamination is the #1 cause of injector/pump failure.
- Monitor rail pressure, EGT, and drive pressure; inadequate air or fuel supply can damage components.
- Some injector sets carry a refundable core charge; details shown in product options or at checkout.
Frequently Asked Questions
Q: Do I need a CP3 and lift pump with 200% overs?
A: Yes—pair with a healthy CP3 (we recommend the Exergy E04 10205 Sportsman CP3) and a quality lift pump for proper supply pressure and filtration.
Q: Is tuning required?
A: Absolutely. 200% overs require custom calibration to manage pulse width, timing, idle quality, smoke, and EGT.
Q: Will these pass emissions?
A: 200% over injectors are intended for off-road/competition builds. Check and follow all local regulations.
Q: Can I daily drive with 200% over injectors?
A: With the right turbo(s), CP3, lift pump, and expert tuning, they can be street-driven; however, they’re optimized for high-power builds.
Q: Warranty and cores?
A: Covered by Exergy’s manufacturer policies. Keep proof of purchase and follow proper install and filtration practices. Core terms (if applicable) appear in the product options/cart.
About Exergy Performance
Exergy is a leader in precision diesel fuel systems. Explore more Exergy components here: Exergy Performance at CPP Diesel.
