Not a M3 but brought my 400awhp Evo 9 Track car to an event. During practice I was wondering why the car was going no where when I put my foot flat to the firewall.
Turns out I forgot to remove my exhaust silencer which reduces my muffler from 4" to 2" in diameter.
Had the silencer put on because the track event was 250km away and my car with screamer pipe and full rollcage is not exactly street friendly.