I got my Chevy Impala '01 with the 3.8l V6 about a month and a half ago, and the speedo goes up to 120. im sure thats about where the governor is, but im pretty sure that i could get it up to 135 or 140, its a pretty quick and robust car, and rides real smooth. Does that mean that i want to? no. i like crusing in it. Its a cruising car. And with the size rims i have on it now, even with the Z rated tires, i dont even want to risk fucking up my rims or getting pulled over. I say just keep it how you have it.