CAI 512-1059-08-B Cold Air Intake For 2005-2009 Trailblazer 5.3LFitment 2005 2009 Chevrolet Trailblazer 5. 3L 2006 2009 Chevrolet Trailblazer SS 6. 0L 2005 2009 GMC Envoy 5. 3L 2005 2009 Saab 9 7X 5. 3L Fitment Notes N A Gains 14 rwhp 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