i wouldnt bother, or dont. i run summer tires all year and have no issues just dont take the m3 when its much below freezing. i have ps2s, ad08s, and nt01s so have a few choice and are listed in order of wet weather performance. lots of performance tires have very good wet traction.
02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings & bearings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW race|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|