This is the muffler that fits the 3rd Gen 4Runners.  Both the 3.4 and the 2.7 liter engines.

Welds right on in.  Nice and quite and a little power boost.  Also mounts quite a bit higher up than the stock muffler for added clearance.

I also had them redo my exit pipe and move it up higher and tuck it behind the rear mud flap.  I smashed the stock one on a rock.