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A switchable valve for the VAG 2.0 litre FSi Turbo engine which allows a choice of Blow off (loud) / Blow off and partial recirculation (intermediate) or total recirculation (quiet). This gives you the choice of exactly how loud you wish your valve to be . Please note the adjustable FMFSiTA valve is not suitable for the Audi A4 due to clearance issues - please use the FMDVFSiT for these vehicles.