The 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. Increase Intake Air Flow CNC Machined Billet Aluminum Pre Drilled and Tapped 1 8 in NPT Ports Note Aftermarket tuning required for use.