As the Air is measured on intake, you will need a recirc (diverter) Valve. Otherwise intake air measurement will be totally wrong. Same with nearly All VAG cars.
Not sure how you got away with that Atomospheric Docurley
Cheers
Peter
P.S Baileys recirc is what mine is running, they are pretty sweet around £85 I believe.
A dv will give you performance and the noise if you either drill a hole or two in the air box or if you get a custom cold air intake. A bov as far as I know only makes the noise but does nothing for performance. Get a DV and forget about the BOV! BOVS are for chavs who want to make their crappy car sound like its a performance crappy car lol
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