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I have an 06 ultra I purchased 6/30/06 and have 3,200 miles as of this post, and want to change the pipes. What I am looking for is just a little rumble. not a lot of noise I would prefer not to have to do any additional mods.. A/C and or a remap inorder to change the pipes. I took the bike in for a check up due to some coughing and a couple of stalls after cold start up. I already had the 25 degree injectors they were installed from the factory. They did some adj and the bike runs great hot or cold and at all speeds. 47 mpg highway. Bike is completly STOCK.
If you are not wanting too much rorte (loud noise) look at the Supertrap internally baffled slip-ons. Looks like stock but sounds way better than stock. The end caps come off and the baffle discs are removable for back pressure adjsutment purposes. Tehy come with 12 discs in each pipe. Supertrap will tell you for a mostly stock bike to put 10 on the left side and 14 on the right side. Sounds good and made a performance difference but does not irritate my neighbors.
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