I've searched here and other places with no luck. My net search-ju has never been all that great. Basically what I'm trying to determine is if the Fed emissions version is the single cat configuration, making the dual cat configuration the KA-only version. According to the FSM the "NA5" is the Fed emissions package and the "NB2" is the KA emissions package.

Since the donor is long gone I can't refer to the SPI sticker to determine which configuration the donor was. This is a swap that has to be KA legal and I intend to build the exhaust system from SS, so I'd kinda like to get it right before I take it to the Referee.