Dynomite Diesel LLY-50NZ 20% Over Injector Nozzle Set — 2004.5–2005 6.6L LLY Duramax

Unlock a noticeable power increase on your 2004.5–2005 Chevy Silverado or GMC Sierra 2500HD/3500HD without replacing the entire injectors. This Dynomite Diesel (DDP) nozzle set flows 20% more fuel than stock, delivering approximately 50 rear-wheel horsepower on an otherwise stock truck while remaining street-friendly and efficient.

These brand-new SAC-style nozzles are sold as a fully balanced and matched set for even fuel delivery across all cylinders. They’re a drop-in upgrade that requires no additional fuel-system or turbo modifications for the base power gain. With proper supporting modifications (tune, turbo, etc.), they can support up to 600 RWHP.

Key Benefits

• Approximately +50 RWHP over stock
• 20% increased flow vs. OEM nozzles
• Safe for stock LLY engines
• Excellent street manners and fuel economy
• Balanced and flow-matched set for smooth operation
• Drop-in replacement — no extra upgrades required for the advertised gain
• Includes new copper sealing washers

Fitment

• Engine: 6.6L Duramax LLY
• Years: 2004.5–2005
• Vehicles: Chevrolet Silverado 2500HD / 3500HD and GMC Sierra 2500HD / 3500HD

Installation Notes

Professional installation and injector calibration by a shop experienced with oversized nozzles is strongly recommended. Horsepower results can vary based on injector body condition and calibration. A pyrometer is recommended to monitor exhaust gas temperatures.

Dynomite Diesel manufactures these premium components in Idaho for reliability and consistent performance.