Injen 01-04 GMC Duramax LB7 6.6L Evolution Intake

If you're looking to get more out of your 2001-2004 Chevrolet Silverado 2500 HD with the 6.6L LB7 Duramax engine, this Injen Evolution cold air intake system is a solid option. It's designed to replace your restrictive factory airbox and intake tubing, allowing the engine to breathe more freely. This can lead to improved throttle response and a more aggressive sound under acceleration.

This intake is built in the USA from cross-linked high-density polyethylene, which is a strong material that holds up well under the hood. It includes stainless steel hardware and automotive-grade urethane couplers for a secure fit. The system features a large, 360-degree SuperNano-Web dry air filter with deep pleats to capture more dirt and debris. Injen tested this setup on their own dyno and found it can add up to 21 horsepower and 43 ft-lbs of torque without needing an aftermarket tune, making installation straightforward.

The Injen Evolution intake is designed to fit directly into your truck without requiring any cutting or drilling. It also incorporates a boost plenum within its two-piece housing design, which is a nice touch for a diesel application. Just remember, this intake is not CARB exempt and cannot be shipped to California or used on vehicles registered there.