GrimmSpeed GRM126034BLK Bypass Valve Black Anodized

The GrimmSpeed GRM126034BLK Bypass Valve is a high-performance recirculating bypass valve (BPV) designed as a direct OEM replacement and upgrade for turbocharged Subaru engines. Built to outperform the factory valve, this unit provides a more precise and reliable pressure response to prevent compressor surge under boost conditions.

Key Features:

• Black anodized aluminum construction for durability and corrosion resistance
• Direct bolt-on replacement for OEM Subaru bypass valves — no modifications required
• Recirculating (BPV) design maintains idle quality and MAF sensor compatibility
• Engineered to handle higher boost pressures than the stock valve
• Precision CNC-machined for consistent, repeatable performance
• Improved sealing over the factory unit to eliminate boost leaks

The GrimmSpeed Bypass Valve is a popular first upgrade for Subaru turbocharged platform owners looking to eliminate the weak OEM valve that is prone to cracking and leaking under increased boost. The recirculating design makes it ideal for street-driven and built show vehicles alike, maintaining proper fueling and emissions compliance.