Sorry about any redundancy on this subject but if I don't ask, I don't know. I'm a new venture owner and trying to absorb as much info as possible. Just obtained HD mufflers with the following part #'s 65591-07 and 65592-07. I seem to remember reading something about not using the the ones ending in 07. Can someone shed some light on this for me.
Is it related to having cats and if so, would I still be able to use them if I removed the cat. Thanks, Al