I'm testing the water on this. I have a Dynatek CDI for a 660. I bought it from Hunterworks about a month ago. Been on 1 ride with it. I discovered that I don't really need it. I don't get over 40 mph. Plus, it messes up the stereo. :) If anybody wants it, I'll take $100 OBO for it. Shipping will be on your dime, and I have Paypal. I paid like $185, I think. Let me know.