I have a 2006 M3 E 46 and use this mostly for the track. Have suspension Bilstein PS 10 brakes, Stop tech brakes, half custom cage, seats, and tire wheel package. I just threw # 5 rod out the side of the block without overrev and no strange sounds or warning. Trying to decide to go used engine, a stock rebuilt, or performance rebuild and trying to decide with the the almost 10k difference in prices but want to last on the track.