Adjustable relief pressure and flow control make fine-tuning on the fly simple and quick with the PERRIN BOV/BPV. Increase horsepower and torque without ECU recalibration or tune! This part is designed and tested to work safely on your vehicle with any tuning required! However, more power can be gained with proper ECU tuning! Confirm any tune or recalibration you add is specific for ALL modifications added to the vehicle. With large 1.225" inlets and outlets, the PERRIN Blow Off Valve is sized perfectly to relieve any amount of boost pressure without fear of compressor surge. Don't be fooled by giant oversized blow-off valves, these inlet and outlet sizes were chosen to ensure the perfect balance of flow and to maintain the boost in your system, without ruining response by dumping too much boost. The PERRIN BOV/BPV cap features adjustable spring tension, which allows for an adjustment when the blow-off valve vents. A looser setting will make it act smooth and more like stock. Setting it hard will cause it to vent later and with significantly increased boost levels. This adjustment is important in maintaining the air within the boost system without reducing turbo response.
The unique design allows you to control the volume of air released when the blow-off valve vents. Adjusting the volume of air helps maintain the perfect amount of boost in your system during shifts without causing compressor surges. Venting too little can damage the turbo, venting too much air can make the throttle less responsive. This adjustment is independent of the relief pressure allowing for a totally customizable BOV/BPV. It is vital that a blow-off valve for your WRX/STi recirculates the air back to the intake track to maintain proper air-fuel ratio and driveability between shifts. While this can be set up as a vent-to atmosphere style blow-off valve, we only recommend that on cars running aftermarket Speed Density type tuning (cars without mass airflow sensor). The PERRIN Blow Off Valve requires very little maintenance but when needed, it's very easy and quick to disassemble. Two O-rings are used to seal vital components from the elements making for extended time between service intervals. There are no special tools required and maintenance can be performed without removing the blow-off valve from the vehicle.
Included with every PERRIN Blow Off Valve are the necessary components to make this a direct bolt-on for your WRX/STi. Each blow-off valve is pre-set out of the box to work perfectly with every application, so no adjustment is required. The PERRIN Blow Off Valve cap, piston, and flange are all CNC machined from 6061 Billet Aluminum. The PERRIN Blow Off Valve body is CNC machined from a single block of aluminum. This makes for a clean look that reduces potential failure points and leaks without additional parts. The PERRIN Blow Off Valve body comes in either a black or red anodized finish and the cap comes black anodized. The anodizing keeps the blow-off valve looking great during its lifespan. The blow-off valve body and cap are pad printed in vibrant lettering to make it easier to read.
- Subaru WRX (2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014)
- Body Material 6061 Aluminum
- Body Finish Anodized Red
- Piston Material 6061 Aluminum
- Piston Finish Anodized Clear
- Spring Stainless Steel
- Flange 6061 Aluminum
- Cap Material 6061 Aluminum
- Cap Finish Anodized Black
WHAT'S IN THE BOX
- (1) PERRIN BOV/BPV
- (1) 12" Hose
- (1) 1/4" Straight Hose Connector
- (1) M5 Short arm hex key
- (1) 1/8 Short arm hex key
- (1) 1/16 Short arm hex key
- (2) M6 Socket cap screws
- (2) Zip ties
- Warranty & Instructions
In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail.
All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).
Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.
For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.
INTERNATIONAL DUTIES AND TAXES
All international orders outside of the USA are subject to duties and taxes per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.