I have heard from several people, that to upgrade to stage 2 on my 2013 WRX. All I would need is a DP and a tune reflash. I'm looking into cobb catted DP to work with my Cobb AP. The question is if I leave the rest of exhaust stock it shouldn't have any boost creep or pressure issues? Want to go stage 2 without being to loud or cause issues with waste gate my car is a daily driver. Any input or insight would be appreciated.