135 is a blast at the track
I took my 135 to Summit Pt (Shanandoah) in May and to Calabogie (Ontario, Canada) earlier this month (July). I am taking it to the Glen in August. I'm still learning to drive the car, but I can tell you it's a blast on the track.
I am using 235/40-17's all around to help the push. It still needs more negative camber at the front, so next winter will see camber plates installed. If you read the forums, braking (overheating) is an issue. I am using Hawk HP+ pads and ATE Superblue fluid and have had no brake problems. Also have had no problem whatever with oil temp.
The power and low RPM grunt of the 135 is amazing. Calabogie has a sharp lert turn and short straight that is up a steep hill. If the M3's caught me on that straight, I had to back completely out of the throttle so they could get wound up and making power.
I believe as these cars age, you will see plenty of them at track events. I bet at some point in time, someone will sell an E46 M3 to buy a 135:wink: