Rev Box Question

[SloLearner]

what can i expect from a rev box on my 400 it has a k&n and a slip on. and would i need to jet it i live in florida....winter exists about 10 days here.

[troutman561]

CDI(rev) boxes are ok on a stock engine, you will some some top end difference unless you go with the ones that have diff. ignition curves, and also, stay away from the white bro. box...