Product Description
Add clean, calibrated fuel to your LMM Duramax. The Industrial Injection 0433171985-R4 Extrude Honed Nozzle (26 LPM / “Race 4”) increases flow for noticeable power gains with proper tuning while helping lower EGT under load. Precision-balanced orifices support smooth idle and drivability on performance builds.
Fitment
- 2007.5–2010 GM 6.6L Duramax LMM — Silverado/Sierra 2500HD & 3500HD
What’s Included
- (1) Extrude-honed injector nozzle with crush washer
Sold individually; order quantity 8 for a complete set.
Why Choose the R4 (26 LPM)
- ~50% over stock flow class for strong gains with correct air/fuel/tuning
- Extrude-honed & flow-balanced for consistent cylinder-to-cylinder fueling
- Clean spray pattern to help control smoke and EGT with proper calibration
Recommended Parts (CPP Internal Links)
- Bostech ISK637 Injector Return Line Kit (04–10 LLY/LBZ/LMM)
- DTECH DT660023 Injector Return Line Kit (04.5–10)
- Industrial Injection PDM-08382 Injector Hold Downs w/ ARP Bolts (02–10)
- Shop All Duramax Injectors & Nozzles
Cross-Reference / Alternatives (Same Platform)
Helpful Notes
- Tuning required to match the increased nozzle flow (rail pressure, timing, pilot).
- Pair with adequate air supply (intake, exhaust, turbo) and fuel supply for best results.
- Competition/Off-Road use where applicable emissions laws restrict modification.
FAQ
Is this a single nozzle or a set?This SKU is for one nozzle. For a full engine set, order quantity 8.
How much power will 26 LPM support?Exact gains depend on turbo, pump, tuning, and overall setup. R4 is roughly a “50% over” class and supports strong street/strip builds when calibrated correctly.
Do I need to balance the set?Industrial Injection flow-balances during the extrude hone process; always install as a matched set of 8 for best results.
Will this fit all 2007.5–2010 LMM models?Yes—fits 2007.5–2010 Silverado/Sierra HD with the 6.6L LMM Duramax.
