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I'm looking at a rev box right now for the 400, but I'm not sure if this is the way to go. Is extending the RPM range like this bad on my engine? Does anyone else on here have any experience with them? Thanks :D

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i think i would look into an aftermarket cdi instead of just a rev box.. there are some like dyna tek that modify timing and other things to increase hp as well as offering different higher rev options...

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An aftermarket CDI will replace your factory unit, I believe the rev box is a piggyback item that just overrides the stock rev limiter and timing curve.

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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!

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what other cheap mods could i do? i don't wanna put much money into it, because I'll prolly sell it in a year and get a kfx450r.

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The exhaust tip is a great way to go if you can't afford a new pipe. You could always remove your airbox lid and jet the carb accordingly. That will give you a noticeble gain. You could always get some front shocks off of a 450 and upgrade your front suspendion.

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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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