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The Turbosmart Kompact Plumb Back kit for BMW N54 twin-turbo 3.0L models (135i, 335i, 535i, Z4) upgrades the factory diverter with a billet aluminum boost-balance valve that fully recirculates excess pressure back into the intake. It offers OEM-style quiet operation with improved durability over plastic units, making it suitable for enthusiasts who prefer recirculating BOV performance without venting to atmosphere.
Turbosmart BMW 135i/335i/535i/Z4 w/ N54 Twin Turbo 3.0L Kompact Plumb Back Kit
