I bought an 04 STI and it blew up shortly after getting. I was mad at first but then realized that It needed a good rebuild. I bought wiesco pistons and manley rods, a new turbo and a few other things. The car already had some good mods done to it. I plan on alteast getting 450whp. I was wondering if getting a stage 2 or 3 cam would help me reach or go past this goal? and If I did would the subaru dealership be able to install that and heavy duty valve springs easily?