I'm gonna go for the oversize Ram Air myself. I drove a highly modified DSG Edition30 with the Evoms intake and found it too noisy on slow cruising (must be getting old
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).
My engine tuner recommended the Ram Air. Simply because he'd recently had a very good result with one...
Eg; standard K03 Mk5, turbo back exhaust, S3 intercooler, custom map. 274bhp and 280ftlb torque.
I thought that sounded very decent so that's the route I'm gonna go. Not exactly the most scientific way to make a decision I know!!!