I did this at an autocross, my time dropped .05 seconds the next run...either better throttle response, placebo effect or just a tighter nut behind the wheel...LOL!
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2009 135i SGM, Premium, Sports, Nav.
Dinan Stage 2 software, Injen intake, RR Oil Catch Can, H&R Pro-coilovers and springs, H&R front sway bar, Vorshlag camber plates, Vorshlag comp studs, BMW strut brace, BMW performance pedals, G-Force harneses, BMP tow hooks, Breyton GTS-R wheels with 255-35R18 (square set up) and custom axel back exhaust with muffler delete.