from what I have read here on the forum it would be very hard to get an NA to run that fast w/o NOS. I mean that is almost stock TT time. My parents have a 325is 5spd and stock it is mid 7 seconds, about same as the NA stock I think. The 325 only has 2.5 litres and it is a '92 so had no variable valve timming on it. I raced a Caddy w/ the big V8 in it a few years back and really pissed the guy off cause he couldn't beat me around town.