[TSM330i]

I can speak from experience and I don't have the HP you have with your modded 335.

I had coil-overs, track only brake pads and no LSD my first track event. I wasn't able to balance my car in the turns. The inside tire would just spin and it was not easy to exit out of slower turns. My car is only a 330i and at the time the engine was completely stock so only 255hp.

LSD would help out greatly on the track. Get a good set of track only brake pads too. If you can't stop, all the power won't do you any good.