Forge Replacement Atmospheric Valve for BMW N20 2.0 Turbo - 320i N20. The must-have blow off valve upgrade for BMW N20 engines. This Forge dump valve replaces the factory electronically controlled bypass valve on BMW N20 2.0 turbo models for sharper boost control, rock-solid reliability and that unmistakable atmospheric whoosh. Perfect for stock cars and a proven upgrade for remapped Stage 1 and Stage 2 N20 setups.
Compatible BMW models - N20 2.0 Turbo
Engine and chassis fitment as per BMW N20 with the electronic bypass valve, including:
- F10, F20, F30 chassis
- 125i, 225i, 220i, 228i
- 320i, 328i
- 520i, 528i
Why upgrade the N20 diverter valve
- OEM diaphragm failures are common. The stock rubber diaphragm can split and leak boost without triggering a check engine light, costing you power.
- The Forge atmospheric valve is a fully engineered, piston-based solution with no diaphragm to fail.
- All aluminium construction for durability under increased boost and in warmer climates.
- Retains desirable OEM ECU control of valve actuation for smooth drivability.
- Recommended whenever boost pressure is raised by an ECU software upgrade or remap.
Key features
- Atmospheric blow off valve - delivers the classic turbo sound while venting excess boost pressure
- Piston-operated design - consistent operation and reliability compared with diaphragm-style valves
- Direct replacement for the factory electronic bypass valve on BMW N20 2.0 turbo engines
- Improved boost holding and long-term reliability versus the stock unit
- Engineered by Forge - a trusted name for performance boost control hardware
Real-world results
We have used this Forge atmospheric valve on our own N20 cars and for many customer builds. Feedback has been excellent, with owners praising the reliable boost control and the crisp atmospheric sound. It is a go-to N20 blow off valve upgrade for 320i, 328i, 125i, 228i, 520i and 528i drivers alike.
Ideal search terms and use cases
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Fitting and support
Professional installation is recommended. For fitting, book with Nforcd in Warwickshire - request a quote at Sales@nforcd.com. Our team knows the N20 platform inside out and can advise on compatibility with your current or future ECU software upgrades.
Important note
This atmospheric valve is for BMW N20 engines only. It will not fit B38, B48 or B58 engines.