on my fj62 with 3fe, i was running exhaust manifold(which off the block has 2 different halves, but both on drivers side, each half had either first three or second three cylinders running into it) then running into the two stock pipes, but i removed the cats and bolted instead to two, 2" pipes which ran parallel into the dual in dual out v8(i forget which series num. i think that was the series 40) Flowmaster muffler. coming out were 2, 2" pipes going to each rear corner of the cruiser. then to 2.5" tips out each corner. made the pickup a little better, but IMHO i was needing the v6 model Flowmaster. the v8 series was a little too free flowing especially since i had no cats. it probably would ran better with the v6 series also. But sounded good. My dogs always new when i was coming home, but it never got to noisy or obnoxious unless i romped on the gas and held it high. but removing the cats allowed for more air flow which was needed, or atleast i thought it was b/c i had a snorkel and k&n which together allowed for more air intake requiring more air outpush or less restriction thru the exhuast so they would be closer together, though with the v8 series Flowmaster, i feel was too much non-restriction for my set up. but it all depends on what you are running and what you are wanting performance wise and sound/ appearence wise. also might depend on your state's emission laws. but going no cats and flowmaster "dual in dual out"(would deff. go with this setup on whatever brand o muffler you choose) with the V6 series they have, would be my ideal setup. also heard that cobra exhuasts were good, but that was a few years back
