Forge Motorsport BMW N20 2.0L Turbo Recirculating/Diverter Valve (F10 F20 F30) 125i 220i 225i 228i 320i 328i 520i 528i Aluminium Piston Bypass/Dump Valve Upgrade

Transform the way your BMW N20 holds boost and responds on throttle. This all aluminium return-to-intake pressure relief unit replaces the fragile factory electronic bypass on the 2.0 turbo four, giving consistent boost retention, crisp spool and dependable operation on daily drivers and tuned builds alike.

On many N20 engines the OE rubber membrane can tear and seep under load, especially on vehicles running increased charge pressure. The result is lost performance, inconsistent power delivery and that frustrating on-off surge. This piston-style assembly removes the diaphragm entirely, using a robust metal internals package that resists heat and repeated cycles while remaining fully managed by the ECU for smooth, stock-like drivability.

Why enthusiasts choose this upgrade

• Eliminates common membrane split issues that cause boost bleed and power drop
• All aluminium piston design for long-term durability under high charge pressure
• ECU-controlled operation for factory-smooth response and stable boost management
• Great on standard cars and those running software calibration or hardware mods
• Improves reliability, throttle consistency and turbo efficiency

Vehicle compatibility

For BMW models with the N20 2.0 petrol turbo in the following F-series platforms:

• 1 Series: 125i
• 2 Series: 220i, 225i, 228i
• 3 Series: 320i, 328i
• 5 Series: 520i, 528i
• Chassis: F10, F20, F30

Real-world results

We install this unit regularly for customers and the feedback is consistently excellent. Owners report stronger midrange, stable boost under sustained load and peace of mind versus the well-known weakness of the stock valve assembly.

Perfect for

• Fixing turbo flutter and inconsistent boost hold on N20 engines
• Cars running Stage 1 or Stage 2 remaps and higher-than-stock charge pressure
• Drivers seeking a dependable, no-fuss solution that retains OEM refinement

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. For a supply-and-fit quote, email info@mjmodifications.co.uk.

Search terms customers use

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