not to be a dick, but im wondering here.
you weight what, just shy of 3000lbs? with those mods, maybe making 300hp, which should put you in the low 13's, maybe high 12s on slicks.
and if im not mistaken the new z4mclass is a low 13 second car stock, with well over 300hp.
it really doesnt sound like you could have pulled him that hard