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The Sinister Diesel cold air intake for 2001–2004 Chevy/GMC Duramax 6.6L LB7 replaces the factory intake with CNC mandrel-bent aluminum tubing and an oversized reusable cotton filter to increase airflow, throttle response and turbo spool-up. Polished and powder-coated in Sinister Blue to reduce corrosion, the kit includes silicone couplers and installation hardware for a straightforward drop-in fit. It’s suitable for daily driving, towing and racing when combined with complementary upgrades.
Sinister Diesel Cold Air Intake 01-04 Chevy / GMC Duramax 6.6L LB7
