I think the Dyna Muffler I put on my Savage indicated that it meets the 88 dB requirements, but I haven't found any EPA regulations that require that level.

In general, noise is controlled at the local government level through nuisance ordinances.  That is, if the motorcycle is too loud, the local police can cite you to court.  THe judge can then impose a penalty or order you to replace the muffler or stop riding the motorcycle.

SAMM, I made it myself, it is stainless steel.

I don't think in Pl any cop will know the difference. So far I have never seen a cop with Db meter. Even in the tech. stations, where they make the anual check, nobody will have it. I don't think it is such a common bike, so the cops know what exactly comes on it.

I don't have any experience with it, but I'll bet Sluggo is right.

That is good sport! buddy of mine with a roadking circles the garage at work keeping count ~40 he thinks at the same time - I can't get but about 10 or so with the jardines

I'm lucky here. Live in Alabama where there is no vehicle testing of any kind. Would eliminate 50% of the cars out there. You can have a stick for a brake, it doesn't matter.
Keep that in mind if you ever visit here.
When asked by "the man" if my pipe is legal, I usually say"WHAT?".
Then I point to the writing on the pipe that says it's legal on a Harley. They don't know the difference. The only place my bike says Suzuki in on the crankcase.

'96 with harley muff with baffle punched. Kinda loud. I like it

At one time Seattle PD were using a decibel meter on the motorcycles coming off the Washington State Ferry system. The bicycles and motorcycles get first on and first off privledges so when they open exhaust bikes leave and go up the ramp it gets pretty noisy. Most times if the state/city doesn't have an ordinance the Federal rules apply if they know what they are. As one who has lost most of his hearing due to loud noise in the workplace I run a baffled heavy wall quality muffler and it easily provides a more appealing sound and appearance but w/o a noise level that will get others attention. HD makes mufflers good for this option, they have much heavier wall thickness and decent size perforations in and out of the glasspac area and stock has a center baffle. With the much discussed 10 deg 7 inch adapter it does make a great low cost option. Max