Reviewed By Martin G (Chicago, IL) Reviewed for a 2004 GMC Envoy —6/27/2008 9:34 PM
WOW!!! I didn't imagine this much torque... It really make a difference. Its a must have along with the airrade intake.
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Reviewed By floyd H (CLARKSVILLE, TN) Reviewed for a 2013 GMC Sierra —6/28/2018 5:58 AM
I installed this at 38,000 miles on my 2013 GMC Sierra 1500 Crew Cab 4x4 with the 5.3 Liter. I can't say the fuel mileage is better in town, seems to be little or no change but on the highway, I am getting approximately 1 to 1.5 MPG more. I can say with 100% certainty that the Throttle response has improved. I can only attribute this to the increase of air flow into the combustion chamber.