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SKU: B724665 | UPC: 700424677184
Cobb 06-07 Mazdaspeed6 / 08-14 Subaru WRX / 09-13 FXT LF Bypass Valve
The Cobb LF Bypass Valve is a direct-fit upgrade for turbocharged Mazda and Subaru models, replacing the factory diverter valve with improved boost handling. It fits 2006-2007 Mazdaspeed6, 2008-2014 Subaru WRX, and 2009-2013 Forester XT, recirculating excess boost pressure to prevent compressor surge. This valve supports higher boost levels for stronger spool and consistent power delivery.
Key Features
- Larger 44mm Piston: Increases airflow over OEM 38mm design, reducing restriction during high-boost operation for quicker turbo response.
- Stiffer Spring: Rated to 43 PSI crack pressure, maintains seal under elevated boost without leaking or fluttering.
- Aluminum Construction: Lightweight and corrosion-resistant body ensures long-term durability in engine bay conditions.
- O-Ring Sealed Cap: Provides leak-free operation and easy adjustment access for custom tuning setups.
- Direct Bolt-On Fit: Matches factory mounting points with no modifications, installs in under 30 minutes.
Product Notes
- Recirculating design vents boost back into intake pre-turbo for emissions compliance and quiet operation.
- Pair with Cobb intake or tuning for full turbo system gains.
Installation Notes
- Professional installation recommended.
- Depressurize system before removal torque cap to 10 Nm.
- Includes all necessary O-rings and hardware for OEM replacement.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2006-2007 | Mazda | Mazdaspeed6 | All |
| 2008-2014 | Subaru | Impreza | WRX |
| 2009-2013 | Subaru | Forester | 2.5XT |
Why Choose Cobb?
- Engineered for Subaru and Mazda turbo platforms with proven track record in motorsports.
- Precision-machined components deliver consistent boost control shift after shift.
- Backed by detailed instructions and U.S.-based support for seamless ownership.
Frequently Asked Questions
-
Q: Will this fit 2008-2014 Subaru WRX STI models?
A: Designed for non-STI WRX STI uses different frame size confirm with VIN for exact match. -
Q: What material is the piston made from?
A: Hard-anodized aluminum piston with PTFE seals for low friction and high heat resistance. -
Q: Does it require ECU tuning or warranty coverage?
A: Bolt-on replacement needs no tune covered by Cobb 1-year limited warranty with proper install.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Compact box measures 7" x 5" x 3"
- Weight: 0.9 lbs shipping weight
COBB
COBB Tuning Performance Parts deliver proven power gains with factory-like drivability backed by an "Engineered Performance" approach trusted by enthusiasts, pro tuners, and performance shops worldwide. Founded in 1999 and now headquartered in Austin, Texas, COBB designs, engineers, tests, and supports its products in-house to ensure reliable results across today's most popular performance platforms. Shop the full lineup of COBB Tuning performance parts at Black Ops Auto Works, including ECU tuning solutions, bolt-on upgrades, and staged power packages built to work together for predictable, repeatable performance. COBB ECU Tuning & Accessport The COBB Accessport is one of the most trusted ECU tuning devices in the industry. It enables safe ECU flashing, live data monitoring, diagnostics (read/clear codes), and tuning management helping drivers unlock stronger throttle response, improved drivability, and dependable horsepower and torque gains when paired with the right supportin...
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