Increases overall RPM limit
Advanced timing curve
Easy direct plug in replacement to stock CDI box
6 Month Limited Warranty
Expertly crafted from premium materials
Quality design and workmanship
Durable construction for long service


Rev Box by Big Gun?«. 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.