Dual Port Hybrid Bov For Subaru 02-07 Wrx & 04-16 Sti Blow Off Valve Turbo USADual Port Hybrid Bov For Subaru 02 07 Wrx & 04 16 Sti Blow Off Valve Turbo USA Up for sale is an adjustable Dual Port Blow Off Valve, brand new in box available in Blue and Black exactly as shown on the picture. These units are fully customize able and are 3 in 1 in terms of functionality. They could be run as: Fully venting off to atmosphere (a. k. a SuperSonic) Fully recirculating like a diverter valve, except still make the sweet BOV sound (a. k. a