Track events can be even more expensive than you think. I mean, everything is optional, but if you really want to have a good time at the track you might want to invest in extra equipment. (Most of these things apply to autox as well)
Track events can be really tough on brakes, depending on how fast you take the car. Autox is rough too, but the runs are a few minutes long, rather than 1/2 hour stints or whatever on a track. You will probably need much better brake fluid to avoid boiling rapidly. You'll probably want to invest in stainless brake lines for extra security and less fade. I guess you could ride in your stock brake pads, but they might fade quickly, so in order to maximize your time on track you'd probably want race pads.
Then you need to ask yourself if riding everyday in the same tires you race with is a good idea. Track & autox can take a toll on tires, so you might want to buy a set to beat on so you don't wear your street set out.
I mean... it all adds up. In autox, you can race whatever you brought. You really don't need to be so prepared, you can just go have fun. In a track event, the level of preparedness is elevated for safety reasons. So the expense can be much greater.
