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Has any one used the Big Gun Rev Box for their 400ex? Thinking about getting one just don't know how much difference a new CDI would make.

Thanks.

/R
tennrider24
 

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Almost none. It raises the rev limiter and thats it. I had a dynaFS on mine for a while because in the newer 400s with reverse it removes the reverse rev limiter which is set factory at like 1000 rpms. But after fighting with tuning the quad and having comstant idle issues and cold and hot start issues i use it as a paper weight now.
 
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