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Big Gun Exhaust Rev Box for 2003-04 Polaris Predator 500 - 40-R10 2008 Kawasaki KSV700 KFX V-Force 1999 Harley-Davidson FLTRXSE CVO RoadBig Gun Exhaust Rev Box Part Number: 40 R10 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 off road MX and ATV