Damn there are a lot of haters on here.
The Greddy Type S is already setup for a recirc, the Type RS is the one with a horn which requires a recirc adapter to use in these cars.
You will need a hose that will fit on the BOV & the intake piping, which will be different sizes. (= harder to find)
You will also need an adapter for the pressure side of the BOV because there is no flange on the S4 DVs.
The design behind the Greddy BOV is not very efficient and you will get compressor surge even on the softest setting.
Push/pull systems work best for recirc, which is what Synchronic, HKS SSQV, & OEM DVs use. (for a reason)
The way these cars are plumbed you wont hear the BOV when recirc anyway, and the 710n's are cheap & work great which makes all the effort & $$ required to fit generic BOVs pointless.
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