Injen 04.5-05 GMC Duramax LLY 6.6L Evolution Intake

Starting with a massive 360° SuperNano-Web dry air filter, this Injen Evolution cold air intake system is built to breathe better. It's specifically designed for your 2004-2005 GM truck with the 6.6L LLY Duramax engine, using a custom-tuned, smooth roto-molded induction tube to reduce restriction and help your engine perform at its best.

The housing and intake tube are constructed from cross-linked high-density polyethylene, a well-built material chosen for its extreme durability and ability to withstand engine bay temperatures. This two-piece box design includes a boost plenum and is engineered to fit precisely under the hood, giving an aggressive look while maintaining an OE fit. Injen has dyno-tested this system and found it can add up to 25 horsepower and 51 ft-lbs of torque without requiring any aftermarket tuning, working with your truck's stock calibration.

Installation is straightforward, with no cutting or drilling needed, and it uses stainless steel hardware and automotive-grade urethane couplers for a secure connection. You'll also notice a more aggressive intake growl under acceleration.