Forge Motorsport BMW N55 BOV/Blow Off Valve, Dump Valve, Diverter/Recirc Kit - M135i F20 F21 & 335i F30 F31 2012-06/2013 PWG - Turbo Pressure Relief Boost Control Valve Upgrade, Billet Piston Aluminium - FMDVF20A

Forge Motorsport Turbo Pressure Relief Valve Kit for BMW N55 - M135i F20 F21 and 335i F30 F31 2012 to 06/2013 - Part FMDVF20A

Transform the way your early F-series N55 delivers boost with Forge Motorsport’s FMDVF20A. This premium aluminium piston valve kit replaces the weak factory bypass unit on vacuum-actuated wastegate cars, giving rock-solid charge pressure control, sharper throttle response and repeatable performance on standard and tuned setups alike. If you want a dependable turbo valve upgrade for your M135i or 335i, this is the proven choice.

Key benefits

• Solves common boost bleed from the stock electronic valve on remapped N55 engines
• Billet aluminium, serviceable piston assembly - no diaphragm to split or leak
• Pressure and vacuum operated via the supplied solenoid while retaining ECU control for OEM-like drivability
• Consistent boost holding for harder, cleaner gear changes and improved part-throttle control
• Ideal on Stage 1 and Stage 2 software, as well as untouched vehicles in demanding conditions
• Complete kit with hoses, fittings and hardware for a tidy, direct-install solution
• Backed by Forge’s Limited Lifetime Warranty for long-term confidence

At MJ Modifications we have installed this kit on multiple N55 cars and the feedback is consistently positive. Owners report steadier boost, crisper response between shifts and the reassurance that comes from a robust, serviceable turbo valve assembly.

Compatibility

For BMW models with a pneumatic wastegate only:

• BMW M135i F20 F21 2012 to 06/2013 - pneumatic wastegate
• BMW 335i F30 F31 2012 to 06/2013 - pneumatic wastegate

Not suitable for electronic wastegate vehicles. If you are unsure which type your car uses, we can check before dispatch.

What’s in the box

• 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

Manufacturer

Forge Motorsport

Warranty

Forge Limited Lifetime Warranty - non transferable

Professional fitting and support

Want it installed correctly first time. MJ Modifications in Warwickshire offer expert fitting and aftercare. Request a quote at info@mjmodifications.co.uk.

Compatibility check before dispatch

We will verify fitment prior to shipping. Provide your UK registration or the last 7 digits of your VIN at checkout so our team can confirm your car uses a pneumatic wastegate.

Search terms our customers use

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