Well I don't believe any of the above. I just had LD bumped from 96" to 103" and my San Diego dealership was more than happy to do the work which included a Stage 1 breather kit and SE Performance mufflers. They said all this chit about MoCo regs and fines etc is a bunch of urband legend rumors.
Yes, Beerman, the 110 motors come with cats as does the upgrade kit, but you can buy the kit without the mufflers. BUT as Harry pointed out to me both the 103 kit and the 110 kit have EPA friendly dog chit cams in them Sooooooo you spend so time, do your research, read around on this site and buy individual pieces. FYI My 96" stock mufflers did not have Cats in them.
later dudes