The Cat Temp Sensor Chip is a must when removing the OEM catalytic converter on Yamaha 1200 Powervalve engines. The circuit is designed to mimic the signal sent to the OEM CDI by the catalytic converter’s temperature probe preventing CDI flutters, warning devices sounding and engine shut downs due to cat removal. Can be used with stock or modified OEM CDI’s. Plugs directly into factory wiring harness. FOR COMPETITION USE ONLY.