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
).
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!!!