Big Gun Exhaust Rev Box CDI Unit for 2004 Honda CRF250R - 40-R23 1975 Yamaha TY80 1973 Harley-Davidson FLH80

1973 Harley-Davidson FLH80

2012 Honda TRX500FM FourTrax Foreman 4x4 Upper

Not stamped metal

2003 Polaris 600 XC SP/XC SP Edge

Big Gun Exhaust Rev Box CDI Unit for 2004 Honda CRF250R - 40-R23 1975 Yamaha TY80 1973 Harley-Davidson FLH80Big Gun Exhaust Rev Box CDI Unit Increases overall RPM limit Advanced timing curve Easy direct plug in replacement to stock CDI box 6 month Limited Warranty If you are looking to swap out your stock CDI box, the Big Gun Rev Box is an affordable alternative to highly priced OEM replacement boxes. It increases the overall RPM limit over the stock box and advances the timing curve. The Big Gun Rev Box is offered for various offroad MX and ATV models.