Synapse DV Mazdaspeed 3 without BOV - Herstellerliste - Produkt Hersteller Synpase Engineering Synapse DV Mazdaspeed 3 - without BOV - only accessories DV Series Synchronic BOV For Mazdaspeed 3, only the accessories - without BOV! Vehicle-specific kit for 1:1 replacement for the standard built diverter valve. The new DV Synchronics of Synapse is the first compact BOV, which operates with a piston valve that works without permanent lubrication. Due to the new technology, it works very fast and is recommended by the compact construction especially in tight spaces. At present, it is the fastest BOV which is available on the market.