Dynomite Diesel LLY-75NZ 30% Over Injector Nozzle Set – 75HP | 2004.5–2005 LLY Duramax

Unlock more power from your 2004.5–2005 LLY Duramax without replacing the entire injector set.

The Dynomite Diesel LLY-75NZ 30% over injector nozzle set is a cost-effective performance upgrade for 6.6L LLY Duramax engines. These precision-engineered nozzles flow 30% more fuel than stock, delivering a noticeable +75 horsepower increase while remaining compatible with a stock CP3 pump and turbo. With the right supporting modifications they can support up to 675 RWHP.

Why These Nozzles?

Dynomite Diesel SAC-style nozzles use patented dual-pilot hole technology (two 0.005" pilots) and a 7-hole design for finer fuel atomization, improved combustion, and a cleaner, more efficient burn. The result is stronger throttle response, smoother power delivery, and typically better fuel economy compared to worn stock nozzles.

This is an excellent option when your existing injectors are still in good condition — you get most of the benefits of a full performance injector set at a fraction of the cost.

Key Features

• 30% increased flow over stock
• +75 hp gain at the wheels
• Supports up to 675 RWHP with proper supporting mods
• SAC nozzles with patented 2-pilot / 7-hole design
• Precision balanced and flow-matched set of 8
• Includes copper sealing washers
• Largest nozzle size recommended for stock CP3 and stock turbo

Fitment

2004.5–2005 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra 2500HD / 3500HD with 6.6L LLY Duramax.

Important Notes

These nozzles must be installed and the injectors professionally calibrated by a shop experienced with oversized injectors. Horsepower results can vary depending on the condition and calibration of your existing injectors. For the most consistent results, have the work performed by Dynomite Diesel.

Not recommended for frequent or heavy towing applications when running a stock turbo.