Well i would be rechecking that boost level once you fit these items!
If you get an exhaust that has a centre muffler and a large oval rear muffler it is likely to be quiet etc, if you get one with a hot dog and cannon you are going to be a defect magnet!
I've never run the stock turbo, most say 12psi is fine but any higher and the factory ECU goes into R&R anyway.
I remember watching this when i first got mine SO SO long ago lol