Performance M
Forge Motorsport Atmospheric Blow Off Valve (BOV) / Dump Valve / Diverter Valve for BMW N20 2.0 Turbo Fits F20 F21 F22 F23 F30 F31 F10 125i 220i 228i 320i 328i 520i 528i
Forge Motorsport Atmospheric Blow Off Valve (BOV) / Dump Valve / Diverter Valve for BMW N20 2.0 Turbo Fits F20 F21 F22 F23 F30 F31 F10 125i 220i 228i 320i 328i 520i 528i
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.
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BMW N20 Turbo Pressure Relief Valve Upgrade by Forge Motorsport
Unlock sharper boost control, addictive turbo sound and rock-solid reliability on your N20 2.0 petrol turbo. This vent-to-atmosphere pressure release valve from Forge Motorsport replaces the factory electronic bypass assembly on BMW F-series models and delivers a crisp gear change “psssht”, stronger boost holding and confident performance on mapped and standard cars alike.
What you get
- Robust piston-operated design for dependable sealing under sustained boost
- Alloy construction for strength and thermal stability in hard road and track use
- Direct swap for the OE electronically controlled unit, keeping factory ECU control and smooth drivability
- Vent-to-atmosphere discharge for a clear, sporty turbo sound on lift-off
- A proven fix where stock diaphragm-based units can leak and waste charge pressure
Why owners choose this upgrade
If you are running a software tune, Stage 1 or Stage 2 calibration, or simply want a reliable solution on a standard car, this Forge valve helps maintain target boost, improves throttle response between shifts and resists the common issues seen with rubber-diaphragm diverters. It also helps reduce compressor surge by releasing pressure quickly when you lift off.
Real-world results
We have installed this unit on numerous customer N20 cars and our own vehicles, with consistently excellent feedback. Expect cleaner transitions on upshifts, consistent boost tracking and that unmistakable turbo whoosh without compromising daily drivability.
Compatibility
For BMW models using the N20 2.0 turbocharged petrol engine with the factory electronic bypass setup, including:
- F20 and F21 – 125i
- F22 and F23 – 220i, 228i
- F30 and F31 – 320i, 328i
- F10 – 520i, 528i
Not suitable for: B38, B48 or B58 engines.
Key benefits at a glance
- Stronger boost retention on spirited drives
- Crisp vent-to-atmosphere sound on lift-off and gear changes
- ECU-integrated control for OEM-like manners
- Durable, serviceable piston assembly with no rubber diaphragm to split
- Ideal for remapped, track day or hot-climate use
Search-friendly terms customers use
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Professional fitting
Want it installed by specialists who know these cars inside out? Book professional fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
Buy with confidence
Trusted by enthusiasts and our own workshop, this Forge Motorsport upgrade adds reliability, response and a great turbo soundtrack to your BMW N20. Add to basket today for fast dispatch and enjoy every boost event with confidence.
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