man, i don't know yet! i'm used to driving slow toyotas (91 celica gt-s and a 92 4runner) and this thing is just INSANE compared to them. i've never really owned anything this fast before, and the closest thing i've driven is a 95 300zx TT, which is faster, but a totally different feeling machine. i still have the factory warranty, so i'm not sure what would void it and what wouldn't. not sure if i would have to get mazda stuff or not.
i've also seen people having the turbo seal problem after modifying the intake or exhaust, and i am kind of weary of doing that if it will hurt the car.