The M4 and my previous sets of M3's on two Subies are the best
tire I've owned, period. One set was wearing down a bit more than I
like in late spring, so I decided to take them into summer,
couldn't wear them out. Great confidence on dry roads, off road
mud, etc. I've been on glare ice where the ABS pumped a whole lot
more than I would have liked trying to...