Adds a socket or sockets (depending on ECU) for easily changing between a tuned EPROM “chip” and factory EPROM chip. Cost includes the new socket(s), removal of current EPROM, and soldering in the new socket. It does NOT include a donor ECU or a new EPROM chip so original chip would be installed into socket or can add a performance chip at the same time if provided. Please contact us before ordering to arrange sending in ECU. Return shipping within the US cost is included in price.