Hyperboost Recirculating Diverter Valves - HX Compact The hottest new product on the market. All the features of the HX Diverter Valve in a smaller and faster package. Now you can fit your HyperBoost in the tightest of spaces. Same width as your factory Bosch valve and only 20% taller. Fits under engine covers for VWs and even in the Porsche Twin Turbo.