you might wanna crawl under your truck and take a look, I have a 97 and it doesen't Y into 1 pipe after the cats.
I'm speaking from a fairly hazy memory and lack of attention to how it was done so I'll check tomorrow since it'll be dark when I get home and I'll let you know. I thought I remembered two cats and a bit of piping after them into a y pipe into the muffler
We'll see, im probably wrong haha and (as far as I know) my exhaust should be stock before the muffler