Volant 01-06 Chevrolet Silverado 2500HD 6.6 V8 Air Intake ScoopIf you want to further increase your Volant CAI kit effectiveness, add on the Volant Cool Air Scoop. Customers using the Volant CAI kit with the scoop report 2 4 MPG improvements in fuel economy, as well as dyno proven horsepower and torque increases. Volant is the first air intake company to properly apply a functioning Cool Air Scoop to a sealed air intake box. This Part Fits: Year Make Model Submodel 2001 2005 Chevrolet Silverado 2500 HD Base 2001