Forge Motorsport BMW N55 Blow Off Valve Kit (BOV/Dump Valve) – M135i F20/F21 & 335i F30/F31 2012–06/2013 Pneumatic Wastegate – Piston Aluminium Diverter Valve Upgrade – FMDVF20A
Forge Motorsport BMW N55 Blow Off Valve Kit (BOV/Dump Valve) – M135i F20/F21 & 335i F30/F31 2012–06/2013 Pneumatic Wastegate – Piston Aluminium Diverter Valve Upgrade – FMDVF20A
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  • Load image into Gallery viewer, Forge Motorsport BMW N55 Blow Off Valve Kit (BOV/Dump Valve) – M135i F20/F21 & 335i F30/F31 2012–06/2013 Pneumatic Wastegate – Piston Aluminium Diverter Valve Upgrade – FMDVF20A

Forge Motorsport BMW N55 Blow Off Valve Kit (BOV/Dump Valve) – M135i F20/F21 & 335i F30/F31 2012–06/2013 Pneumatic Wastegate – Piston Aluminium Diverter Valve Upgrade – FMDVF20A

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Forge BMW N55 Blow Off Valve Kit for M135i and 335i with Pneumatic Wastegate — Part No. FMDVF20A

Upgrade your BMW N55 turbo engine with the Forge Blow Off Valve Kit FMDVF20A, designed specifically for the early BMW M135i and 335i models with a pneumatic wastegate. This high-quality BMW N55 blow off valve, also known as a dump valve or diverter valve upgrade, replaces the failure-prone factory bypass valve to deliver stronger boost holding, improved throttle response and reliable performance on both standard and remapped cars. If you are chasing dependable power on a tuned BMW M135i or 335i, this Forge BOV kit is a proven solution.

The OEM electronic bypass valve on many N55 engines can leak or be blown open under higher boost without triggering a fault light, costing you power and consistency. The Forge FMDVF20A is an all-aluminium, piston-based valve with no diaphragm to fail. It is pressure and vacuum operated via the included solenoid and retains desirable OEM ECU control of valve actuation, giving you OE-like drivability with motorsport-grade durability. Ideal for cars running Stage 1 or Stage 2 software, as well as stock vehicles operating in warmer climates where reliability is critical.

Why choose this Forge BMW N55 blow off valve kit

  • Direct-fit BMW N55 dump valve kit for M135i and 335i with pneumatic wastegate
  • Piston-based design with no diaphragm to split or leak, helping prevent boost loss
  • All aluminium construction for strength, heat resistance and long-term reliability
  • Retains OEM ECU control of valve operation for smooth part-throttle and full-throttle transitions
  • Perfect for tuned cars with increased boost pressure and for standard cars in hot conditions
  • Comprehensive kit with hoses, solenoid, bracket and hardware for a clean install
  • Supported by Forge’s Limited Lifetime Warranty for peace of mind

At Nforcd we have installed this kit on multiple N55 cars. Feedback from our customers has been excellent, praising the consistent boost holding, sharper response between shifts and the confidence that comes with a robust, serviceable valve. If you are searching for a BMW M135i blow off valve, BMW 335i blow off valve, N55 BOV, N55 dump valve or a BMW N55 diverter valve upgrade, this FMDVF20A kit is the upgrade enthusiasts choose for reliability and performance.

Compatibility

This Forge blow off valve kit fits BMW N55 models with a pneumatic wastegate:

  • BMW F20 and F21 M135i 2012 to June 2013 — Pneumatic wastegate
  • BMW F30 and F31 335i 2012 to June 2013 — Pneumatic wastegate

Not suitable for vehicles with an electronic wastegate. If you are unsure, we provide a compatibility check prior to dispatch.

What’s included

  • 1 x FMDVF20A Valve
  • 1 x 3000 mm of 4 mm vacuum tube
  • 1 x 100 mm of 6 mm vacuum tube
  • 1 x 50 mm of 6 mm 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

Part number

FMDVF20A

Manufactured by

Forge

Warranty

Forge Limited Lifetime Warranty, non-transferable

Fitting and support

Want professional installation for your BMW N55 blow off valve upgrade? Nforcd offers fitting at our workshop in Warwickshire. Request a fitting quote at Sales@nforcd.com.

Compatibility check before dispatch

To ensure the part fits your vehicle, we run a compatibility check prior to dispatch. Provide your UK registration number or the last 7 digits of your VIN at checkout and our team will confirm fitment.

Search-friendly terms

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