You can fit the REAL M6 wheels (which are actually FORGED, not cast) on your M3. They fit like a glove with stock tire sizes. I'm using 255/35R19 up front for my winter setup and have some slight rubs with full turns, but the Bridgestone Blizzaks are wider and more square on the edges. PM me if you want a hook up, I got mine for $1500 a set, which is really good considered these are forged rims.
