Product Description
Unlock serious race fueling on your LBZ/late-LLY Duramax. The INDUSTRIAL INJECTION 521COBRA5175 Competition Injector is built for dedicated competition use where maximum fueling and precise control are required. Sold individually; order eight (8) for a complete set.
Fitment
- 2006 LLY 6.6L Duramax (mid-year LLY applications)
- 2006–2007 LBZ 6.6L Duramax
What’s Included
- (1) Industrial Injection COBRA Competition Injector — 521COBRA5175 (sold individually)
Key Notes
- Competition use only. Not legal for any on-road, off-road, or dual-use vehicles.
- Core charge may apply per injector; see cart and policies.
- Professional installation and calibration/tuning required.
Recommended Parts (CPP internal links only)
- High-Pressure Injector Lines (LBZ/LMM) — replace aged lines during injector service.
- S&S 10mm High-Speed CP3 (LB7/LLY/LBZ) — supports higher commanded rail with competition injectors.
- ARP 230-4201 Head Stud Kit — recommended for high cylinder pressure builds.
- Need even more fuel? 521COBRA5184 (Max Output 580cc)
- Shop All GM Duramax Categories
FAQ
Is this injector legal for street or off-road recreational use?No. This is a dedicated competition use only component and is not legal for any on-road, off-road, or dual-use vehicles.
How many injectors do I need?These are sold individually. A V8 Duramax requires eight (8) injectors for a full set.
What supporting mods do I need?At minimum: a healthy or upgraded CP3, clean high-pressure lines, adequate lift pump/supply, and custom tuning. For higher power, add head studs and airflow upgrades.
What’s the difference vs. 521COBRA5184?The 521COBRA5184 is a higher output competition option (listed at up to 580cc) for extreme builds; 521COBRA5175 is the “call for max output” competition injector for LBZ/late-LLY platforms.
