Originally Posted by M3 Esq.
Hankook RS-3 is a good choice as well. Plenty grippy at the track and good on the street. And they are reasonably priced. I'd probably stick with the stock sizes unless you don't mind your speedo being off a bit.
Unfortunately RS3's are not available in any 19" sizes that fit the front of the M3.
'04 E46 M3 - Jet Black - Sold
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'13 E92 M3 - Alpine White - Ohlins TTX, Fall-Line Suspension Arms/Bushings, AP Racing BBK, OE GTS Aero, Cobra Seats, Akrapovic GT4, GMG 4-point, BBS E88