Procom makes alot of the cheapie CDI's out there, i.e. Revbox, Big Gun, compare the part number on the cdi and its a procom. I would go with a Dyna if they make one for the 250. I have the RevMax, beleive its a Procom, maybe a little better but always carry my stock one just in case. All it did was allowed my 350 to rev higher.