Originally Posted by Bubbles
I think everyone is jumping the gun with the 1M track performance. Having sufferred through heat issues on the track with N54 engine (even after oil cooler upgrade, intercooler upgrade, straight distilled water, fog lamp removal), wait and see if the M division addressed this issue. The V8 handled 95F+ ambient temps just fine over a very long track day, it is a work of art.
based on the PR release is sounds like they didnt do squat, straight port of the iS engine from the z4/335. Guess we should be asking the owner of those cars how well they have held up on the track since they upgraded the cooling system a bit for those cars.