I got a 05 WRX, Cobb stage-2 93 octane. Purchased a Cobb up-pipe and was going to install myself at my buddy's shop. However found a tuning shop here in the Charlotte NC area that will install it for $175. My question is the guy I've been talking to said that I sould get a custom tune after the up-pipe install to prevent over-boosting and that I would get about 30 WHP with this tune as well. Thoughts on this? The car is not my everyday driver just FYI.