400ex rev box - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-09-2005, 07:11 PM
400ex7
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400ex rev box

Hey whats up I have a 2003 400ex with a k&n filter,stage 2 jet kit, stage 2 hotcam, and a fmf slip on I have been thinking about adding a rev box. Does anyone know which may be the best kind to use? I have heard the Big Gun one is preatty good [img]/ubbthreads/images/graemlins/thumbsup.gif[/img]
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post #2 of (permalink) Old 06-16-2005, 01:35 PM
fox250 racer
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Re: 400ex rev box

Before you do that i would suggest that you get the header for the exhaust. I don't think it it would be a good idea to get a rev box, sure it will give you about a 2000 rpm increase but your peak horsepower will be somewhere i believe around 5,500 rpms. So all you are really doing with that rev box revving you engine past where it needs to be which can damage your engine. But if you do decide to get a rev box anyway i would get the big gun as well.
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