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Forge Motorsport FMDVF20A DV/BOV Dump Valve Kit for BMW M135i M235i N55 (F20 F21 F22) - Turbo Recirc Diverter Valve Upgrade, Boost Leak Fix, Stage 1/2 Ready

Forge Motorsport FMDVF20A DV/BOV Dump Valve Kit for BMW M135i M235i N55 (F20 F21 F22) - Turbo Recirc Diverter Valve Upgrade, Boost Leak Fix, Stage 1/2 Ready

£211.67
£211.67
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Forge Motorsport FMDVF20A Diverter Valve Upgrade for BMW M135i and M235i

Unlock reliable boost control and sharper response on your BMW M135i or M235i with the Forge Motorsport FMDVF20A performance diverter valve kit. This premium aluminium piston valve replaces the fragile factory unit on N55 3.0 petrol turbo engines, giving consistent charge pressure, crisper gear changes and proven durability on both road and track.

Perfect for remapped cars and spirited driving, this kit cures common boost leak issues from the original electronically actuated recirculation valve. Power can fade without a warning light when the OE unit bleeds under load. The Forge solution uses a precision piston rather than a rubber membrane, so it holds boost reliably, resists heat soak and keeps your turbo happy. It integrates with the car’s management for smooth, OEM-like operation with performance you can feel.

We have installed this kit on customer cars and our own builds with excellent results. Feedback has been consistently positive, highlighting stronger mid‑range pull, dependable boost retention and a satisfying turbo sound under throttle lift.

Why choose this DV kit

  • CNC‑machined aluminium body with a piston design for long‑term reliability
  • Maintains seamless control with the factory management for refined drivability
  • Holds higher charge pressure on tuned setups, ideal for Stage 1 and Stage 2 calibrations
  • Improves throttle response and reduces compressor surge
  • Complete install package with hoses, hardware and vacuum lines
  • Serviceable and tuneable with the included uprated spring

Fitment

Designed for BMW models with the N55 3.0 turbocharged straight‑six and the OE electronic recirculation valve located on the compressor housing:

  • BMW M135i F20 and F21
  • BMW M235i F22

Common search terms this solves: BMW N55 diverter valve upgrade, M135i dump valve kit, M235i DV replacement, F20 F21 F22 turbo recirc valve, boost leak fix for N55, BMW 135i 235i performance BOV, remap friendly DV, track day proven valve.

Part number

FMDVF20A

What’s in the box

  • 1 x FMDVF20A Valve
  • 1 x 3000mm of 4mm Vacuum Tube
  • 1 x 100mm of 6mm Vacuum Tube
  • 1 x 50mm of 6mm Vacuum Tube
  • 1 x Solenoid, Bracket, and Screws
  • 10 x Cable Ties
  • 1 x Uprated Blue Spring
  • 1 x 8‑4‑8 T Piece
  • 1 x Forge USB Instructions
  • 1 x Forge Keyring and Sticker

If you wish to tailor the response to your specific tune, a spring tuning kit is available separately.

Professional fitting

Installation available at MJ Modifications in Warwickshire. For a fitting quote or expert advice, email info@mjmodifications.co.uk.

Why buy from us

Trusted by enthusiasts nationwide. Fast dispatch, genuine parts and hands‑on product experience. This is a proven upgrade for the BMW 135i and 235i platform that delivers the reliability and performance your N55 deserves.

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