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					Originally Posted by Ciotti  Apparently it's not so common because you're dead wrong
 Track days are hard on tires, brakes, and your wallet (one track day costs as much as a full season of autocrossing)
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 More wear on all bushings (you generally go around the bends a good bit quicker than autocross), cooling system as you said, tires, brakes, engine and trans and general drivetrain (since you should spend most of your time on the track in high RPM to have peak power at all times). I'm not saying that you will wreck your engine during lap 3 of the day but that the general wear and tear increases significantly over time. It's like benching at the gym, you might be able to do 150lbs for a minute straight, but try doing it for 10, you'll feel every muscle and joint crying for help.