I just recently purchased an Invidia Catless DP, and a Perrin CBE. My question is this. Am I going to run into huge problems on an 07 WRX if I wait to do an Up-pipe? I could afford to do the up-pipe now if need be but if I wait is there going to be any major short term issues? I have read about Turbo grenading and what-not....so I am just curious.