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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 parts for turbocharged performance platforms are stocked at Black Ops Auto Works. Shop the Accessport ECU programmer, cold air intakes, cat back exhaust systems, and supporting hardware engineered for Subaru WRX and STI, Ford Focus ST and RS, Ford F-150 EcoBoost, Mazdaspeed3 and 6, Nissan GT-R, Porsche, BMW, and Volkswagen platforms. Every product is filterable by year, make, model, and trim so the correct part ships the first time. Black Ops Auto Works carries 372 COBB SKUs across tuning, intake, and exhaust categories. What This Brand Covers COBB Tuning built its reputation on the Accessport, one of the most widely used ECU flash tools in the aftermarket, and has expanded into intakes, exhausts, downpipes, and supporting hardware for a range of turbocharged platforms. The catalog centers on a defined group of import and Euro performance vehicles rather than a single brand family. Brand Focus COBB Tuning parts are engineered primarily for Subaru, Ford, Mazda, Nissan...
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