I have no idea, I let the muffler shops do my installations. What did you find out about your other problem? Should at least acknowledge the efforts others put into it. That would show good form on this forum.
Been there done that with the muffler shops, don't have one I trust too much around here so I like to go with the bolt-ons. Didn't mean to come off as having bad form either, I know all about the appropriate form on boards as I'm one of few Moderators at www.starquestclub.com, a board I've been apart of for many years now.