i have an 03 v6 and put on stock '04 17" gt rims from my brothers car and didnt do anything special. i just threw them on and drove. you dont to my knowledge you dont need low profile tires. my speedometer seems to be right on, maybe off by a mile or two per hour (who gives a s**t). the only problem i found is that when u turn the wheel to the absolute maximun to the right or left there is some minor rubbing in the wheel well. i just dont go all the way and i am fine. no problems here.