This replacement diaphragm is engineered specifically for the integrated Compressor Recirculation Valve (CRV) found on BorgWarner EFR (Engineered For Racing) series turbochargers. Over time, constant heat cycles and high-boost operation can fatigue the original rubber, leading to tears that cause boost leaks and diminished throttle response.

Installing a fresh CRV diaphragm restores the turbocharger's ability to properly recirculate air during throttle lift-off. This prevents compressor surge, protects the compressor wheel from axial load spikes, and ensures your turbo stays on the boost threshold for better recovery between shifts. It is a vital maintenance component for any EFR-equipped vehicle experiencing erratic boost behavior.

• Genuine BorgWarner replacement component
• Compatible with all BorgWarner EFR series turbochargers featuring an integrated CRV
• Restores factory boost response and pressure management
• High-temperature resistant elastomer construction
• Direct-fit service part for the internal blow-off valve assembly

The Cobb BPV Paper Gasket is a precision-cut replacement seal designed to maintain an airtight interface between your bypass valve and its mounting surface. Over time, original gaskets can compress, dry out, or tear during valve maintenance, leading to boost leaks and inconsistent engine performance. This high-quality paper gasket ensures a reliable seal to maintain proper pressure regulation within the intake system.

• Function: Provides a boost-tight seal for bypass valve mounting
• Material: High-grade gasket paper
• Condition: Replacement for worn or damaged factory gaskets
• Manufacturer Part Number: BPV_PAPER_GASKET

Fits select 2002-2007 Subaru WRX and 2004-2017 Subaru WRX STI models.

The Cobb BPV Adapter (812500) provides a precision-engineered solution for mounting upgraded bypass valves to the factory intercooler flange. This adapter is essential for maintaining a secure, leak-free seal in your turbocharger's recirculating system, ensuring consistent boost pressure and throttle response during gear changes.

Machined to tight tolerances, this adapter replaces the standard interface to allow for the installation of performance-oriented hardware. Its durable construction is designed to withstand the high heat cycles and pressure variations common in turbocharged EJ-series engines.

• Precision machined for a direct fit onto the factory mounting points.
• Compatible with factory intercoolers and specific aftermarket upgrades.
• Ensures a flat, reliable sealing surface to prevent boost leaks.
• Includes necessary hardware for a straightforward installation.
• Manufacturer Part Number: 812500

Fits 2014-2018 Subaru Forester XT and 2015-2018 Subaru WRX.

The Cobb LF (Lightweight/Fast) By-Pass Valve is a precision-engineered performance upgrade designed to replace the factory plastic unit. Where the original equipment can often leak boost or respond sluggishly, the LF BPV utilizes a fast-acting piston design to ensure immediate response and reliable boost pressure retention. This component is essential for maintaining turbocharger efficiency and improving overall throttle response during gear changes and deceleration.

CNC machined for exact tolerances, this valve bolts directly to the factory mounting locations and maintains the stock recirculation configuration. This ensures that metered air stays within the system, preventing the stalling or rich-running conditions often associated with atmosphere-venting valves. It is a robust solution for both stock and modified vehicles looking to improve drivetrain reliability.

• CNC machined aluminum construction for superior durability
• Lightweight, fast-acting piston improves turbo response
• Direct bolt-on replacement for the OEM plastic bypass valve
• Recirculating design maintains correct MAF sensor readings and drivability
• Manufacturer Part Number: 745670

Fits 2006-2007 Mazdaspeed6, 2008-2014 Subaru WRX, and 2009-2013 Subaru Forester XT.

The Cobb LF (Low Frequency) Bypass Valve (MPN: 724665) is a high-performance replacement for the factory-installed plastic unit. Designed to handle increased boost levels while maintaining a quiet, OEM-like acoustic profile, this valve ensures your turbocharger operates efficiently by preventing boost leaks and compressor surge.

• Replaces failure-prone factory plastic bypass valves
• Optimized for consistent boost pressure management and reliability
• Provides faster response times during shifts and throttle transitions
• Durable construction designed for modified and stock engines
• Manufacturer Part Number: 724665

The Cobb Tuning Universal LF BPV (Bypass Valve) is a high-performance recirculating valve designed to improve turbocharger response and reliability. As part of the "Lightweight Fast" (LF) series, this valve is engineered to actuate quicker than traditional heavy-piston designs, ensuring boost pressure is managed efficiently during throttle transitions and gear changes.

• Compact design allows for easier installation in tight engine bays
• Machined aluminum construction for superior durability under high boost pressures
• Recirculating operation keeps metered air within the system for optimal drivability
• Internal piston design reduces rotating mass for faster actuation
• Prevents compressor surge and protects turbocharger internals
• Manufacturer Part Number: 715665

As a universal component, this BPV is intended for custom applications and may require specific hoses or adapters for proper integration into your vehicle's charge pipe system.

Fits 2002-2007 Subaru WRX, 2004-2017 Subaru STI, and 2006-2008 Forester XT.

The Cobb XLE Bypass Valve (BPV) is engineered to eliminate the pressure leakage and slow response times common in factory Subaru bypass valves. As you increase boost levels, the stock plastic or stamped-steel components often fail to maintain a consistent seal, leading to lost power and inconsistent throttle response. This high-performance BPV is precision-machined to ensure your turbocharger maintains peak boost pressure throughout the RPM range, providing the reliability needed for both street and track applications.

• Precision-machined construction for superior durability and consistent seal integrity
• Direct replacement for the factory valve to handle increased boost levels
• Designed to improve turbocharger response and pressure management
• Compatible with factory mounting points for a straightforward installation
• Manufacturer Part Number: 712665