GFB DVX Sound Adjustable Diverter ValveGFBs DVX Takes The Extremely Popular DV+ Diverter Valve And Adds Dual Venting Outlets Along With Our Patented Venting Bias Adjustment System. So Not Only Do You Get IMPROVED BOOST HOLDING And THROTTLE RESPONSE, You Have Total Control Over Your BLOW OFF SOUND VOLUME! WHAT MAKES DVX DIFFERENT TO ANY OTHER VALVE THAT GOES WHOOSH? The DVX is not just a noise maker (like BOV spacers) by modifying the valve operation method it offers the same PERFORMANCE