Here is a little video I made comparing my lap times. In the larger picture my former track car an E36 M3. This is at the Autobahn from 2012. In the smaller box on the left hand side my current track car my 135i. Lap was taken this past week October 14th, 2014. Starting point was synced as close as possible, sound was from my 135i lap.
specs
1998 E36 M3. 5 speed manual
AST coilovers, Vorshlag camber plates, eibach front sway bar, shark Injector, AFE CAI, borla exhaust, moiton motorsports undertray, LTW replica rear wing & Kosei K1s w/ Dunlop Star Specs
2011 135i DCT
BMW PPK, ETS intercooler, Berk Sport Exhaust, M3 front sway bar, M3 front control arm kit, M3 rear upper control arm kit, M3 subframe bushings, Swift spec r springs, Koni dampers, dinan camber plates & LTW5 wheels w/ Michelin Pilot Super Sports