I have the Berk with the GTM stage I TT. I don't know how much of a difference a 3" would make cause I've only had the 2.5. What I can say is that the car rips at 8psi. My boost was up around 11psi at first and I was slipping the stock clutch so there is plenty of power with the Berk exhaust.
And I will second what others have said about the oil cooler. Go with the 34 row with the thermostatic plate. My oil temps never go above 220 and on a cool day are right around 190-200.
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