Mark is right on.
I had a stock 930-stock intercooler for the longest time. I have a 7006-SC Cams-MSD6AL-BB-Dual exhaust-No Cat-HKS AIC- 1BAR Spring-.etc..etc..
Just upgraded to an Andial/Intercooler--short neck.(bolt on).
& KEP-STAGE 2-Lightweight PP-CLUTCH Yes there is quite a big difference on top end..Didn't think it would be that much of a difference in performance..But it is...The only downside is that my fuel mileage did go down quite a bit.
..Gotta stay off the throtle.....Boost is a badass drug...
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Would suggest to get AFR-Meter for safety..My plugs look good..but u never know..
Turbo/boost is going to cost u either way...U LIVE ONCE...ENJOY IT.
P.S--If I was going for an exhaust-- i heard the hooligan and the quieter version recently..Both are sweet.
Walt