i had hit 135 back a couple years ago when the gt-s was stock. Once i hit 135 i let right off the gas so if anything it mighta gone up like 1 or 2 more mph, lol. Havent taken it up to 100 in the past year and havent hit 90 for a while, i take it up to 80-85 tops now on the highway, no need to be crazy.