Originally Posted by Autobahn335i
Bigger discs will limit the choice of wheels. Not many 18" clear the 380mm kits.
Stopping power will indeed be virtually the same and heat dissipation a bit better with bigger discs. But even the "small" 355 or 365 BBKs will outperfrom any stock setup by a large margin.
Many people who got the ST 380mm front kit got the APEX wheels. Their new wheel will even accept the Brembo 380mm BBK up front now.