RDP Motorsport is now an American Distributor for The Knock Box. Engine knock detection tool, essential for any performance engine tuning.THE KNOCK BOX was originally developed in 1992 during Nissan GTR32 race development program and after extensive testing both in Australia and Internationally through carefully selected channels, it is now widely used through out the International racing community. Single, Dual and Pro Logger systems available. For more information on The Knock Box, email [email protected]