which cdi?

[00tn300ex]

I need a cdi for my 300ex that increases the redline by about 1500 rpm's,give or take a little.what is a good brand and where could i get one?ive seen the hot shot boxes but they do not say wat the rev limit is.

[300exboy #15]

get a big gun rev box its a little more expsive but it gives u 3-4 hores more the other boxs do 2-3