Big Gun 99-04 Honda XR 400 Rev Box - 40-R15

If you are looking to swap out the stock CDI box on your Honda XR 400, 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.

• Increases overall RPM limit
• Advanced timing curve
• Easy direct plug in replacement to stock CDI box
• 6 Month Limited Warranty