The Machs run really good with simple bolt ons. There is one local on big n littles, full exhaust, cams, 4:56 gears, and he ran 11.60s... I dont know his mph but I believe he said the car put down roughly 330 at the tire. Impressive to dip in the 11s with that kind of power. Then again, if the S197s were a couple hundred pounds lighter I bet they would do the same.