Product Description
Push your LBZ/LLY to the edge of competition performance. The INDUSTRIAL INJECTION 521COBRA5184 is a GM Duramax competition injector calibrated for 580cc max output—built to support serious fuel delivery for high-boost, high-RPM builds. Intended for race/competition use only.
Fitment
- 2006–2007 6.6L Duramax LLY/LBZ (Chevrolet Silverado / GMC Sierra 2500HD, 3500HD)
What’s Included
- (1) Industrial Injection competition injector, 580cc max output
- Core charge may apply (see cart/options on product page)
Recommended Parts (CPP internal links only)
- Fleece LBZ/LMM High-Pressure Injection Line Kit (Full Set, 2006–2010)
- Bostech Injector Return Line Kit (LLY/LBZ/LMM)
- S&S Diesel NEW LBZ-Based CP3 Pump (LB7/LLY/LBZ/LMM)
- Shop All Duramax Injectors & Nozzles
- Fuel Injection Line Category (Duramax)
Cross-Reference / Alternatives
- Industrial Injection 521COBRA5175 Competition Injector (LLY/LBZ)
- Industrial Injection 0986435521SE-IIS Stock Reman (LLY/LBZ)
- Industrial Injection 0986435521SE-R2 (25 LPM)
- Industrial Injection 0986435521SE-R6 (38 LPM)
Helpful Notes
- Competition/race part. Tuning, adequate air supply, and fuel system upgrades are required.
- Replace all high-pressure lines when installing new/reman injectors to avoid contamination and leaks.
- Verify return line condition; replace seals and hoses during injector service.
FAQ
Is this a single injector or a set?This listing is for one competition injector. Order quantity 8 for a full engine set.
Will it fit both LLY and LBZ in 2006–2007?Yes. It’s built for the 2006–2007 6.6L Duramax LLY/LBZ platform. Always confirm VIN/engine code before ordering.
What fuel system mods do I need?At 580cc max output you’ll need adequate supply and high-pressure capability (e.g., performance CP3), lift pump, clean filtration, and custom tuning.
Do I have to replace injector lines?Recommended. Old lines can shed debris or leak under rail pressure. Use new LBZ/LMM high-pressure lines for reliable sealing.
