Genesis Upgrades Blow Off Valves | Performance Upgrades for Automotive Applications. Take a look at the Blow Off Valves we sell from top brands including HKS, Turbo Smart and Turbo-XS. We sell Blow Off Valves for vehicles including Hyundai and Universal. We offer Blow Off Valves for applications including Hyundai Genesis Coupe, Universal Universal and more. Select your vehicle from the search filter below to view Blow Off Valves by vehicle make, model and year.