the BMW CCA schools. I didn't make ANY mods to my M3 for 2.5 years - once I took it to the track, it was obvious to me the car was soooo much faster than me, why waste the bucks? Another huge benefit that comes from driving on the track is that you drive much saner on the street...you tend to get all that "wildness" out of your system on the track, with the added plus of an instructor sitting at your side, keeping you within your limits. I honestly think I've paid for the school's fees by what I've saved on insurance costs!