The Deceptor Pro II blow-off/bypass valve system for the 02-07 WRX & STI is the very first in-cabin, electronically adjusted blow off valve. Adjust the valve from 100% venting to 100% recirculating or anywhere in between at the turn of a dial from your driver's seat! Swap from 'stealth mode' to 'scare small children mode' as easy as flipping on your stereo system! The Deceptor Pro II is one of those modifications that is sure to turn heads and raise eyebrows whether you are on the street, at the track or at your local car meet. Revised porting allows more airflow and venting bias while the new bore finishing process will ensure a lifetime of reliability. The Deceptor Pro II system for the 02-07 WRX & STI is a direct factory replacement kit that includes everything you need for a complete install with no cutting or further modification to your Subaru.