[Longhorn Man]

I highly doubt you have them. Even one in cali would not need it for 99% of the engine swaps.
However, if you want to verify 100%, look under at your pipes, and count the mufflers. If you have one muffler per pipe (most of these trucks have true daul exhaust) If you have one muffler per side, you're golden. If there's two mufflers per side (best way to describe it to someone who doesn't quite know) then get us a photo.