Has anyone had a significant gain or decrease in milage after installing a GT40 topend? Id love the extra power it produces, but dont want to sacrafice any milage (with my foot out of it, of course)
Cool, good to know. I want to have a little fun with my car and I was thinking GT40 Topend + an S-Trim. Should be a nice little street car with good manners still.
i get just about the same mileage with my gt40 topend as i did with the stock top end. I get about 18 in mixed driving and about 22-25 on the highway depending on how fast i drive. I also have 3.73's so it would be better with 3.55's or 3.27's even. good luck man.