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You are more than likely to get several thoughts on this topic. Alot depends on what you are looking to do. If you are looking for more sound but little increase in performance, I would suggest slip-ons. If you are looking for performace, many have done complete change to true duals.
In my case, I was looking for the old school HD sound so we went with Reinhart Slip-ons. I bought an 12 Ultra Classic EG for touring and not for the speed. Price played a huge part in the decision as well.
The final decision of which route to go is all yours. I went to a few bike rides and listened to engines similiar to our's before deciding which slip-on to go with. You might want to give that a try.
If you still have the 08 Ultra you can get by with just adding slip ons, on the newer bikes with the cat in the headpipe you'll get rid of a lot of heat by going to a full system.
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