I hope its not too late
The cdi box is something that isn't needed on a 300ex, mabe a 450, but not a 300ex.Go ahead and get verything else. If you have extra $ go ahead and get a Dyno Jet kit (it comes with everything you need for rejetting), port and polish, and get the flywheel shaved, and get an aluminum swing arm skid plate. When running the new air filter you will want to run it with the airbox lid ON. You get better velocity that way. If you have anymore questions just PM me, I like giving advise.
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