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Forge Motorsport BMW N54 Diverter/Dump Valves Recirc BOV Kit - 135i 335i 535i 1M Z4 35i (E82 E90 E92 E60 E89) - Billet Piston Turbo Bypass DV Upgrade, Boost Leak Fix, Direct-Fit Twin Turbo - FMDVBM35

Forge Motorsport BMW N54 Diverter/Dump Valves Recirc BOV Kit - 135i 335i 535i 1M Z4 35i (E82 E90 E92 E60 E89) - Billet Piston Turbo Bypass DV Upgrade, Boost Leak Fix, Direct-Fit Twin Turbo - FMDVBM35

£178.80
£178.80
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

FMDVBM35 Turbo Bypass Valve Set for BMW N54 - Leak-free recirc solution for 135i, 335i, 535i

Cure pressure loss and keep boost rock-solid on your twin turbo straight-six. This premium recirculating pressure relief valve package replaces the fragile factory diaphragm units with rugged, piston-operated billet bodies that seal hard, respond fast and keep airflow consistent under throttle lift. Ideal for stock and tuned cars wanting dependable performance without hissy atmospheric noise.

Part number: FMDVBM35

What makes this upgrade stand out

  • Direct replacement pair for N54 turbocharger bypass locations on 135i, 335i and 535i
  • Piston internals hold higher pressure than OE membranes - stops bleed-off and wavering boost
  • 6061-T6 CNC-machined aluminium bodies for strength, heat resistance and long service life
  • High-temp Viton sealing rings with Mobil 1 synthetic grease for ultra-smooth action
  • Spring options included so you can match valve control to your target boost level
  • Full piston stroke maintained for excellent flow on lift-off and crisp throttle recovery
  • Multi-layer reinforced silicone couplers for an easy install on factory airbox and charge pipes
  • Heavy-duty, bevelled-edge clamps with pressed drives - NATO-grade spec for secure clamping
  • Proven on daily drivers and mapped builds looking for consistent power and reliability

Why N54 owners choose this recirc set

The OE membrane-style valves are known to split and seep, causing lazy spool, erratic target pressure and lost performance. This kit uses a serviceable, metal piston layout that resists heat soak, keeps the system airtight and restores the sharp response you expect from a healthy twin turbo setup. It is a fit-once solution that retains OEM-like manners while supporting elevated boost on tuned cars.

What you get in the box

  • 2 x Valves - handed left and right
  • 1 x 25 mm x 400 mm Mega Flex silicone
  • 1 x 25 mm x 330 mm Mega Flex silicone
  • 4 x 40 mm clamps
  • 2 x Uprated yellow springs
  • 1 x Forge sticker

Real-world confidence

We use this setup on our own N54 builds and have supplied and fitted it for many customers. Feedback is consistently positive - firmer boost control, smoother drivability and dependable sealing on both factory and remapped engines. If you want a tidy, recirculating solution that just works, this is the one.

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Request a fitting quote via info@mjmodifications.co.uk.

Search-friendly terms customers use

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