[CosmosMpower]

Are you sure the M2 fits in TT4? I think it's over on p/w especially with Hoosiers unless the driver weighs like 300 lbs. What average hp did your car put down on the dyno? Most stock M2's dyno around 330 whp on a dynojet which is what NASA TT uses. In order to be at 12:1 the car needs to weigh 3,960. If you run DOT tires between 255 and 275 you get .3 back which means you still need to be at about 3730.

My M2 with 18x10 wheels and 275 NT01's with me in it (150 lbs) weighed in at 3540. I don't think you're going to get to 3730 and make it for TT4 unless you have a really low reading dyno and a lot of ballast.

I think realistically it's a TT3 car with some good prep. Around here TX region it's up against some fast prepped E46 M3's that weigh around 3,200 lbs with driver.