The video here is just a small part of the comparison EuroTuner Magazine did which will be featured in the August 2011 issue. Obviously, it isn't really fair to compare a tuned M3 to a stock 1M but Willow Springs (namely the Streets) is a tight track that favors lighter cars. The M3 has a GIAC tune, H&R coil-overs, Brembo brakes, with Continental CSC3 tires. The 1M starts in front but the M3 pretty much reels it in at will.
Originally Posted by EuroTuner
The 1M is an amazing car but the M3 still has the edge, particularly with our GIAC software, GruppeM titanium exhaust and carbon fiber intake. Furthermore, we fitted H&R coilovers, 19" Forgestar wheels, Continental CSC3 tires, six-piston 365mm Brembo front brakes and plenty of weight-saving carbon fiber pieces from BMW Performance, Turner Motorsport and Vorsteiner.
While the cars are dicing for the video, our M3 definitely had the advantage on the brakes and at high speed. But the 1M's low-speed torque made it fast out of the turns.