Forge Motorsport N54 Recirculation Diverter Valve Kit for BMW 135i 335i 535i Twin Turbo (E81 E82 E87 E88) - Billet Piston DV Upgrade FMDVBM35 - Direct OEM Replacement, Boost Leak Fix

Turbocharger Bypass Valve Set for BMW 135i, 335i, 535i with N54 engine

Replace tired factory diaphragm units with Forge Motorsport’s precision piston valves and restore rock-solid boost control on your twin turbo BMW. This recirculating bypass solution keeps airflow within the intake for smooth drivability, sharper throttle lift-off, and consistent power on both standard and tuned setups. A proven fix for pressure leaks and lazy response, it is a straight swap on cars running the 3.0 petrol N54.

Each valve is CNC machined from high grade billet aluminium for strength and accuracy, using a durable piston design with high temperature fluoroelastomer sealing rings and premium synthetic lubrication for long service life. Interchangeable springs let you tailor the closing force for increased boost targets without sacrificing piston travel or flow. The kit includes reinforced silicone couplers and quality clamps that are gentle on silicone yet grip securely, giving a dependable, quiet recirc upgrade that avoids the drawbacks of atmosphere-venting solutions.

Why this Forge piston valve kit is a must-have

• Direct swap for the OE diaphragm units, plug-in fit with factory connections
• Billet piston architecture for fast response and reliable boost holding
• CNC milled housings for precise fitment and leak-free performance
• High temp seals and premium synthetic grease for durability under heat and load
• Spring tuning options included, ideal for stock, Stage 1 and Stage 2 calibrations
• Full piston travel maintained for excellent flow and crisp throttle closure
• Multi-layer fabric-reinforced silicone joiners integrate neatly with the intake system
• Silicone-safe, bevelled-edge clamps with secure drive mechanism
• Quiet recirculation inside the intake, the sensible alternative to a loud BOV
• Battle-tested solution to common N54 pressure loss and DV failure

Fitment

• Engine: BMW N54 3.0 twin turbo petrol
• Models: BMW 135i, 335i, 535i using the N54 engine
• 1 Series chassis from title: E81, E82, E87, E88

We run this setup on our own N54 projects and for customer builds. Feedback has been excellent for stable boost, rapid response and long-term reliability on factory calibration and remapped cars alike.

What you get

• 2 x Forge piston valves, left and right
• 1 x 25 mm x 400 mm reinforced silicone hose
• 1 x 25 mm x 330 mm reinforced silicone hose
• 4 x 40 mm silicone-safe clamps
• 2 x uprated yellow springs
• 1 x Forge sticker

Part number: FMDVBM35

Fitting and support

Straightforward installation with no permanent modification required. For professional fitting, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-ready phrases to help you find this kit

BMW turbo recirculation valves, N54 turbo bypass valve kit, BMW 135i boost valve replacement, 335i compressor bypass valves, 535i charge air bypass, BMW turbo pressure relief valves, N54 boost leak repair, silent recirc valve set, Forge piston valve upgrade, BMW charge pipe valves, BOV alternative for N54, BMW twin turbo valve kit, performance turbo valve upgrade, plug and play turbo valve BMW, N54 tuning support valves, BMW 1 Series E81 E82 E87 E88 turbo valves, BMW 3.0 twin turbo pressure control valves, BMW dump valve replacement kit.