Purpose built for the 2001/2 featuring the unique variable exhaust port system resulting in superior venting of excess pressure, a popular choice for the street. Purpose built to bolt on the 2001 & 2002 model WRX No adapters required Quick and easy fitment Adjustment via the unique Quick Wrist action (no spanners required) Supplied with a replacement flange gasket and blanking plug Why do you need a Blow-off Valve (BOV)? To eliminate compressor surge when changing gears. Excessive backpressure is created when the throttle is closed during gear changes or deceleration, causing turbo cavitation. This is detrimental to the life of your turbocharger; however fitting a BOV will substantially improve this problem. By installing a BOV you will significantly reduce turbo spool up time. You will notice a substantial improvement in response from your turbo between gearshifts. Boost will come on earlier giving an increase in torque at lower RPM. Why choose a Turbosmart BOV? Turbosmart BOV’s demonstrate our commitment to innovation, quality and performance – each BOV piston is hand matched to a body forming a unique matching set User Friendly spring adjustment - tune the spring simply by turning the cap of the BOV They are the highest flowing and most efficient valves on the market and are a popular choice by racers Fitting A Turbosmart BOV is made easy thanks to the Mult-Fit adapter system, unique to Turbosmart All Turbosmart BOV’s are supported by a comprehensive range of model specific adapters They can handle an unlimited amount of boost pressure All Turbosmart BOV’s come with comprehensive installation instructions All Turbosmart BOV’s carry a Life Time Warranty* How to choose a Turbosmart BOV! Go to BOV Fitment Guide to see which BOV and Adapter will suit your vehicle Purchase Model Specific Blow-off Valve recommended to best suits you.   WARNING! The incorrect use of Turbosmart products may result in damage to your vehicle. Failure to observe any notes or recommendations may result in incorrect use of the products. Turbosmart products are intended for use in off-road racing only. Turbosmart will accept no responsibility for the incorrect use of its products. Turbosmart will not be held responsible for any damage caused to property or person, directly or indirectly related to the use of any Turbosmart product.