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Big Gun 40-R05B - 02-03 Yamaha Raptor 660 Rev Box margin_10 AllStar Performance ALL11080 - KoulBig Gun 40 R05B 02 03 Yamaha Raptor 660 Rev Box If you are looking to swap out your stock CDI box, the Big Gun Over 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.