Product Description
S&S Diesel LLY-200SAC-SET 200% Over Injectors (NEW) — 2004.5–2005 GM Duramax 6.6L LLY
Built for serious power. This brand-new set of eight S&S Diesel Motorsport injectors uses EDM/honed SAC nozzles sized 200% over stock and is flow-matched for consistency. Intended for competition or extreme performance builds where adequate air, fuel supply, and custom calibration are in place.
Fitment
- 2004.5–2005 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD — 6.6L Duramax LLY
What’s Included
- (8) Brand-new S&S LLY-200SAC injectors — 200% over SAC nozzles
- Flow-matched set for balanced fueling
- O-rings/seals as supplied by manufacturer
- Manufacturer documentation
Recommended Supporting Parts
- Lift Pump Upgrades (Duramax) — ensure sufficient low-pressure supply for high-flow injectors.
- Fleece PowerFlo In-Tank Lift Pump (04.5–07 LLY/LBZ) — proven in-tank solution for LLY builds.
- CP3 Pumps & Components (Duramax) — consider stroker/HS pumps or dual-fueler systems for 200% injectors.
- Head Studs & Fasteners (Duramax) — added clamping for high boost (e.g., ARP/Gator).
- Browse Duramax Injectors/Nozzles — compare sizes and options.
- Shop All S&S Diesel at CPP
Installation & Notes
- Custom tuning required. 200% over injectors demand proper calibration and adequate air (turbo(s)/intercooling).
- Strongly recommended: lift pump, upgraded CP3 supply, high-flow filtration, and head studs for sustained high boost.
- Intended primarily for off-road/competition where applicable. Verify local regulations.
FAQ
Do I need a lift pump and CP3 upgrades with 200% injectors?
Yes. A quality lift pump and higher-capacity CP3 (or dual-fueler) are strongly recommended to maintain rail pressure and protect the system under high fuel demand.
Are these injectors street legal?
200% over injectors are competition-oriented. Check your local and state laws before using on public roads.
Will stock turbo(s) work?
Not recommended. Plan on upgraded turbocharging and supporting airflow mods; otherwise you will see excessive smoke and EGT.
Do these require custom tuning?
Absolutely. Proper calibration is mandatory for drivability, power, and component protection.
Are these new or reman?
This listing is for NEW injectors (LLY-200SAC-SET). Reman options exist from various brands but are not part of this product.
