Yes they have a limp mode.. And the Dyna WILL bypass that, also it will bypass the reverse limiter.. But, if yours is in limp mode, it won't run more than a few miles an hour.. There is a switch in the belt housing that will need to be reset.. Usually they won't trip the switch unless you shred a belt or something.. The dyna cdi will make a VERY noticable difference for sure.. I wouldn't ask the dealer for any more advise if I were you !! Just search this forum and you will find everything you need. Also, if you have not had your valves adjusted since you had it, you might want to look into that.. There are ALOT of knowledgable people here that don't mind helping at all, which makes this an AWSOME website !!!! Hope this helps.