[s346k]

i would guess all you need is some seat time to run the car to its potential. shifting is everything in an m6 car and is frequently reflected by the trap speed. that car would easily be 2 mph slower on the stock wheels, putting you around 116 mph. which in my opinion is hardly faster than a stock one. mine went 115 when it was completely stock in 2600' da.

i never raced my car at the dragstrip on the factory wheels, but i made some dragy hits just for something to do. 4 things to consider: the car made 441 whp at this time, was 2 mph faster on those drag wheels you are using, i had a 175 lb passenger in the car and the da was a lot closer to 3000'. mid july in central indiana is terrible. the car always picked up 26+ mph on the back half. i frequently saw 27+ on those race stars.

my opinion: your car should be 120+ mph as it sat. hard to say if it's in the tune, driving, or both. et ultimately tbd by 60'.