Reviewed By Michael B (Spotsylvania, VA) Reviewed for a 2007 GMC Yukon XL —12/29/2014 8:27 PM
Would have rated 5stars But the mileage decreased Love the sound and extended HP and torque NICE!! Thx again auto anything On time !!!
Reviewed By Brandon L (Mount Pleasant, SC) Reviewed for a 2015 GMC Yukon XL —10/14/2014 3:26 AM
Product showed up quick and has definitely help the engine on this large suv. I have seen and increase of 2mpg in city, but have not taken it on the highway yet. The instructions could be better, but overall I'm very pleased.