Reviewed By Michael S (Neenah, WI) Reviewed for a 2006 GMC Sierra —6/30/2013 7:51 PM
At first I wasn't sure if it really was working cause I couldn't really see big changes but after about a month I noticed the mpg gains. The power increase was quite amazing too. I feel this is a great product and as they say" you get what you pay for ". Already thinking about upgrading to the IQ.