I have the 2" baffle on my Rush mufflers that I had on my 09 Road King. Sold the bike and removed the mufflers. I bought a 2011 Ultra Classic and was going to put the mufflers on the Ultra with the Vance and Hines fuel pak and a K & N air filter. I was told that the 2" baffle was to small for the Ultra, and it would blow the 02 sensors out of the pipe. I would have to go to the 2.5" baffle. Has anyone heard of this or had any trouble. I like my 2" baffle, the sound and everything. That is why I took them off my Road King. I travel through different states and do not want to deal with being pulled over because of noise. Never had a problem with the mufflers on the Road King, everything was stock except the mufflers. Any ideas would help.