only difference I could see is the Ultra has an xtra-12 suspension and the Ultra sp has the xtra-10 suspension.Here is a link to look up the info.
Thanks ACEXLT- I agree Triples with Triple pipes rule!! I could listen to them all day. Any comments on a great clutch kit or set up to bring the low end of the machine alive? It screams from 30 to 80 - but it is a dog out of the hole. It has 196 studs.
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