Big Gun Exhaust Rev Box CDI Unit for 1999-04 Honda XR400R - 40-R15 1983 KTM 500 K4 2004 Yamaha YFM660FH Grizzly Hardwoods

2004 Yamaha YFM660FH Grizzly Hardwoods Hunter Edition

2019 Arctic-Cat ZR 7000 w/137" T

Part Number: 37-1126

2011 Yamaha XVS1300A V-Star

Big Gun Exhaust Rev Box CDI Unit for 1999-04 Honda XR400R - 40-R15 1983 KTM 500 K4 2004 Yamaha YFM660FH Grizzly HardwoodsBig 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.