I have to say, out of all my mods, my brembo 380 kit is the best addition to my M3 from both a performance and an aesthetic standpoint.
2011 E90 M3 ZCP - Individual Moonstone/Individual Amarone Extended/Individual Piano Black With Inlay:LINK!!!
1994 Euro E36 M3 Sedan - Daytona Violet/Mulberry:LINK!!!