Phillip Dollar (Texas) | January 9th, 2014
Bought this for my 09 Duramax for a little more power but mostly to change for aftermarket tires on my truck. It says it works for tire size but you are not told it only works on certain vehicles which mine is not one it works for of course. Seems to add a little HP on economy otherwise this was a waste of my time and money. Now i am wondering about how hard this is gonna be to return or exchange since i have had to call a few times and am still waiting for a return call.