You can get a Toyota OEM exhaust tail pipe assembly (axle-back muffler section)... Just a universal muffler will require welding and refitting of the hangers.
I believe you could use a 2" in/out muffler. Your tail piping should be about 1-7/8" OD?... Check out Flowmaster SUPER HP-2, dBX, or 50 series. Most are available with 409SS internals, with either a 409SS or polished 304SS casing.