have had the car to 170 a couple times w/top off and windows down (before the 3.55) and was pleasently surprised at how solid it felt. on one ocassion i had a friend follow me in a genI but he had to let off at 140 because he had his soft top on but other than that he felt pretty comfortable at that speed. as i recall roy terpstra from tnt has taken his king snake to 208 in a stock bodied gts with no problems. you might wanna get your suspension checked before you attempt it again. come to think of it...the car felt as solid @170 as my vette did @150. and please be careful at those speeds.