I was looking into taking my car out to the track and this is what BMWCCA, Los Angeles' packet says:
"Vehicle Modifications: Our schools are intended to make you a better driver in your own car in regular traffic. Novice students are strongly encouraged to avoid the use of R compound tires or suspension and engine modifications. Learn to drive with your car as close to stock as possible then start adding modifications."
The only mods I have made are mods I would make no matter what and it sounds like the guys above are basically saying the same thing. Sounds like good advice that I will be taking, I might even put my JB4 in map 4 so I can log but not have the added tune, we'll see but I'd listen to them and enjoy!