Supra TT are way better for aftermarket mods. 500hp is very achievable with a twin turbo. The BPU setup offered by suprastore.com is good for 400+rwhp@18psi. BPU means that you have a boost controller, catback exhaust, downpipe, and a boost cut controller. With the addition of cams and cam gears you could be looking at close to 450rwhp. A stage1 turbo upgrade can get you well into the 500s for not alot of money. Even with 500+rwhp the car would still be extremely reliable and streetable. If you are going to up the hp I recommend getting a 6speed so that you dont have to build up the auto tranny, the 6speeds are more exspensive, but soo much more fun
