I had my gearbox freshened (though not by G-Box) when I had it out, and am also running a Guard LSD, which, with ~400HP on tap, is of enormous advantage. Push the car a bit, and you'll certainly feel it at work.
Why did you decide on a Stage 3 clutch? I have a 12:8:1 compression 3.8 (which lives on race fuel) and I'm only running a Stage 2 SPEC.
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Boxster S
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