Originally Posted by alms211
255/35/19 with 295/30/19 is the ideal setup
Agreed, but you will rub ever so slightly with 295's on the stock ZCP wheels. Also, a 295 tire is starting to get heavy, and you really need a lighter wheel to compensate.
The ultimate wheel/tire set up for the M3 is BBS FI with 255/295 Michelin PSS.