CAI 501-0519-B Cold Air Intake For 2005-2009 Impala V8 5.3LFitment 2005 2009 Chevrolet Impala V8 5. 3L 2006 2007 Chevrolet Monte Carlo V8 5. 3L Fitment Notes N A Gains 12 fwhp Up to 3 MPG increase in Fuel Economy Performance gains indicated is to the wheels (whp), with tests done on an otherwise stock vehicle. We test our intake systems under real driving conditions, and dyno test to the wheels with the hood closed. Many competitors test with the hood open and advertise gains at the crank, which results in