So, took the car to an exhaust shop today and got the 2.5" down pipe on, sounds slightly more hoarse, but not very noticeable, the car is still somewhat quiet when compared to modified cars.
These velcro pads are pretty damn useful and stick very well to the plastic material inside and metal in the engine bay.
Also installed my Greddy Profec B! I must say, it was a little more routing of shit than I thought, but I got it all worked through, tested it with the low boost setting and got it set to about 11 psi and holy damn! The car is really fast now. I didn't set the high boost setting, I'll leave that for the dyno.
More news after I take the car to the tuner this Friday and get my Z32, Power FC and injectors installed.