Reviewed By Richard B (Pittsburgh, PA) Reviewed for a 2011 Chevy Avalanche —10/25/2016 8:35 AM
I haven't noticed any signficant change for gas mileage but the sound and horsepower that my truck puts out is awesome and I only have a stock exhaust!
Reviewed By Jennifer W (Alva, OK) Reviewed for a 2011 Chevy Avalanche —9/7/2011 7:51 AM
First off, the sound is amazing, not too loud, but powerful. I haven't drove enough to check mileage, but assume it will increase a bit. Could immediately tell the increase in HP. I would definately recommend.