for anyone who is looking to replace the stock cdi box on your shee i would recommand buying the dyna fs cdi box it is flat out awsome.it works great and is cheaper then stock.higher rev limitter and great power and with 4 preprogramed ign curves.if you purchase the sofeware kit you can program your own curves.i had to put in bigger mains to run it but thats all. easy to hook up, excellent craftsmanship and a warranty to boot.