Well i finally joined the subaru after my integra got stolen. I just bought a new black 07 wrx. I plan on going cobb stage 2. Now before going state 2 i was going to get the perrin DP front section and back section plus the perrin UP, and single tip sports exhaust. Now i was wondering if i needed anything else or if anything else was recommended before i went stage 2 or if perrin was the best choice for going stage 2. I know its not the cheapest choice but at this point that doesnt matter i prefer to spend extra cash to get quality stuff. Also how can i prevent this from voiding my WTY? Would i have to take all the stuff off and just put the stock stuff back on and reflash the ECU back to stock or what? Any help is appreciated!