In the early 2000's a friend offered to take me on a ride-a-long at a track-day event he was going to. Man, was I hooked! Talk about some serious adrenaline, and G-forces, and speed! It's certainly not the worlds most cost-effective hobby, but nothing is quite like rocketing down the front straight of a track like Thunderhill at over 120MPH. I've also enjoyed track days at Sears Point, Buttonwillow, and the Lone Pine air strip (high-speed autocross.)
Over the years I've owned a number of of track cars. My first foray was with a C4 Corvette (1995) - Largely stock, except for safety equipment. I started out with a bolt-in roll bar, but wanted to migrate up to a full cage eventually. The cabin on C4's is a bit cramped, and the few vettes I saw at the track with full cages required massive modifications/hacking to work, and with my ~6' frame, I wasn't sure I'd safely fit with a full cage. After a minor contact accident on the track, I decided if I was going to stick with doing track days, I needed to upgrade and get a safer car.
My current track car is a 2008 Subaru WRX STI. It used to be my daily driver, but has taken over the reigns as the track toy. 300HP, all-wheel-drive, and it's unbelievable to drive on the track. In fact, it's actually a little more fun to drive it on a damp day with a light drizzle. The AWD just rocks, and the subtle 4-wheel drift in the corners is intoxicating.