I've yet to get into more than a couple pounds of boost, but she feels responsive.
The MB Performance wheels + Hoosier QTP's are going to gain me a lot in terms of traction, reduced wheel hop, and get this... They saved me 16.5 lbs of weight PER wheel/tire assembly.
To-do list: Fabricate custom 4" cat-back, install WBO2... Change oil... Tune?