Synapse (SB001A.KIT003) Synchronic Blow-Off Valve Kit for Mitsubishi Evolution Synchronic BOV package; SB001 is the iconic Synchronic BOV that has set the standard for impossibly fast response from a BOV/DV This is a direct bolt-on kit that replaces the factory diaphragm diverter valve with a single, fast-acting piston-actuated Synchronic BOV The kit comes complete with all hardware necessary for a bolt-on installation Synapse boost-connect fittings and hoses included