ive done little over 130 in my ls with fireball muffler and short ram, thats it, soon to find out that my tires were R rated or somethin, the ones where that rated speed is a little over 110. ive hit 130 about four times since i had the car, one time waz out running a chevy blazer whos house we egged, yea he never caught up, but found out who i waz considering he waz my schools janitor and his neighbor got my plate adn the janitor checked the parking lot. the only thing that keeps me from goin over 130 is drag, maybe when the car gets lowered it will be easier, thank god for no speed governor, never know who you gotta out run.