LB7 Duramax Intake Air Heater Delete Plug Fleece PerformanceThe Fleece Performance Intake Air Heater Delete is a simple way to remove the air intake heater on your 2001 2004 GM 6. 6L Duramax. Complete with a pre drilled and tapped ports for a boost gauge, nitrous, water methanol injection and other accessories. Features: Increase Intake Air Flow CNC Machined Billet Aluminum Pre Drilled and Tapped 1 8 inch NPT Ports Note: Aftermarket tuning required for use. Vehicle Fitments Chevrolet Silverado 3500 2001 to