Tracked my car last week at Castrol Raceway (near Edmonton), and had a couple of issues.
Tires - Stock Michelin PSS started chunking.
Brakes - Getting some wheel judder on the street afterwards which is probably caused by pad buildup
Engine - Got 2 drivetrain malfunction errors on different sessions. Car drops into limp mode and I had to get into the pits, and turn the car off/on to reset. I have JB4 without the fuel connector installed (causing me fuel trim issues), and I got a drivetrain malfunction on Map 2, as well as on Map 1. Both times, my low fuel light was flashing at me which could be a culprit.
Here's a video of my last session of the day. Out there with me was an E92 M3, E46 M3, a couple Z4M's, and an Evo. The car performed really well.