Turbosmart BMW 135i/335i/535i/Z4 w/ N54 Twin Turbo 3.0L Kompact Dual Port Kit

This Turbosmart Kompact Dual Port Kit includes a billet aluminum blow-off valve designed to replace the factory plastic diverter and bypass valves on turbocharged BMWs with the N54 twin-turbo 3.0L engine. You'll get the main valve assembly, which is a direct swap for the OEM units, along with the necessary high-temperature O-rings to ensure a solid seal. This kit is designed for a range of popular BMW models, including the 135i, 335i, 535i, and Z4, offering an improved solution over the stock components.

The Kompact valve uses Turbosmart's Boost-Balance Valve Technology, which is proven in motorsport. This system helps maintain optimal performance and reliability by managing boost pressure effectively. Unlike the stock plastic and rubber valves, this unit is constructed from solid billet aluminum, making it much more durable and capable of handling higher boost pressures without leaking or failing over time. The Dual Port design means it vents some air to the atmosphere for that characteristic blow-off sound, while also recirculating some back into the intake system. This dual action helps keep things quieter during normal driving but still provides the full venting benefit when you're pushing the car harder.

Because this is a direct replacement for the factory diverter valves, installation is straightforward, requiring no welding or major modifications. It's a well-built upgrade that addresses a common weak point in the N54 engine's induction system, helping to ensure consistent boost control and a more responsive feel. While this kit is designed for a wide range of BMWs, it's important to note that it is not CARB approved and cannot be shipped to California.