Hello i am new to this site. Im getting a 2002 WRX this wednsday. Dont really know much about them, but ive always loved them since the first day they came out. I was wondering if anyone could help me out in detail on what are some very good cheap most hp efficient mods i could get for this car, i was thinking about getting a turbo back exhaust system, but dont really know if i should trust ebay, even though they look legit. And a nice aftermarket blow off valve. I wouldnt know what else to get to begin...Please help. Thank you.