Big Gun Exhaust Mini Rev Box for 2004-08 Yamaha YFM50 Raptor - 40-R21 MPN_18-941 2018 Ski-Doo Expedition 900 ACE

2018 Ski-Doo Expedition 900 ACE SE

1988-91 Yamaha YZ250

2010 Honda XR650L

2018 Ski-Doo Renegade 600 E-TEC Enduro

Big Gun Exhaust Mini Rev Box for 2004-08 Yamaha YFM50 Raptor - 40-R21 MPN_18-941 2018 Ski-Doo Expedition 900 ACEBig Gun Exhaust Mini Rev Box Part Number: 40 R21 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