Reviewed By Steven C (Oceanside, CA) Reviewed for a 2004 Hummer H2 —8/17/2010 6:53 AM
Easy to install. No idea about any extra HP or gas milage. I have only been doing short city driving. My commute to work is no more than 10 miles a day. I will have to wait a bit until I can make a decent highway trip to see if my milage improves. Overall, I am satisfied.