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Big Gun Exhaust Rev Box CDI Unit for 2001-12 Yamaha TT-R125 models - 40-R29 feed-mpn-65-0308 2015 Polaris Sportsman 1000 TouringBig 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.