This PROCOM Performance CDI by Magnum for the Honda 400EX (05-09) increases the rev limit by 1,000 RPM over the stock rev limit. In addition, this unit offers a re-mapped timing curve which yields a noticeable increase in horsepower and torque over the stock CDI. This CDI box is a direct plug-in replacement CDI. Simply locate and remove the stock CDI, and plug the Procom unit directly into the wiring harness, no modification is needed. Suitable for stock and modified machines

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