Dual cat

Yer gunna have to make it dude.

Doc

Depending on what State your in, will depend on what you can do. In California for example you can't convert it over to a true Dual system even if you were to add another converter.

Yes because they don't allow any changes from the OEM configuration due to extremely tough emission laws. Talk to a reputable exhaust shop in your area, they ought to know what's legal in your state.

Brian

Only if by design they remove the same amount of emission that a single does. The state of California doesn't feel like getting in the exhaust engineering business to determine if an exhaust system installed by an owner meets OEM specifications. I'm not agreeing with it just explaining it.

Brian

Well, if you are going to do something illegal anyway, why not just go to true duals without the cats. Another thing to try may be what I plan to do: Tri-Y hedders Two into one crossover pipe

3" cat 3" pipe to the back without muffler I tried it before and a cat without the muffler is at least as quiet as some of the mufflers I hear on the street these days.

All of the above can be had with certification that will pass any test you will encounter.