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The Big Gun Rev Box is a CDI?!?!??! You really won't see to much of a gain with just the CDI upgrade. A more aggressive cam with the CDI... Now you're talking!

This is true, the biggest advantage of a rev box or aftermarket CDI, is that it lifts the rev limiter, unless you are riding up against the limiter all the time, it won't make much of an improvement, aside from higher top speed unless you compliment it with other mods to take advantage of the more aggressive timing curve. Like Bot said, open up the intake and re-jet, a new high flow intake is not too expensive either. A set of cams is a good upgrade too, they would really help you get the most out of the other little stuff, but they are a little more expensive.

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