HKS Universal Super SSQV 4 Blow Off ValveIf youre installing a turbo system, its very important that you take every precaution to run it safely. The blow off valve (BOV) is an essential component that relieves pressure to prevent the turbos compressor from going into surge. This HKS universal blow off valve is rugged, dependable, and sounds great too. Every part matters when youre upgrading your car, and this critical part will give you the performance that discerning gearheads demand.