My new personal best with my stock M3 F80 (except break pads). This lap was on Michelin Cup 2 tyres. Under 7.45 is possible. My M3 is from 2015 and is not the M3 competition. I think with the M3 competition, under 7:40 could be possible (better setup spring dampers, more power,…). I have manual transmission but with DKG I could easily be 2 or 3 seconds faster over a whole lap. But manual tranny is fun..:) Enjoy