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the 4 piston front & 2 piston rear brakes you have are considered an upgrade from previous model years, and can work very well for autoX. I would suggest as others did, to look into batter pads - rotors, Stainless Steel lines, and a better brake fluid. I know of many people who AutoX the wrx on the older style stock brakes (2 piston front & single piston rear) and perform quite well with proper pad & rotor choice.
Depending on how much you are looking to invest, Powerslot & DBA make very nice rotors. I would look for a slotted rotor as opposed to a drilled rotor as many people feel as though drilling can affect the rotors overall strength.
and as for pad choice - this is where things get tricky. when it comes to brake pads, they make a pad for every kind of use IE: street, autoX, hardcore track racing. the thing is though, that race pads usually need to be warmed up - which makes them downright dangerous for street use. race pads also be loud & noisy. while this doesnt matter on a track - on the street it can get real annoying real fast. street pads are great for the street as they are quiet & grip well without warmup - but put them on a track and they will overheat & not work well at all. so the best thing to do would be to have separate pads for the street & the track (which many people do). if you cant swing 2 pad sets however, choose a pad that is one step up from being a "street" pad. the panther plus from carbotech is a popular choice.
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