I got a high flow catco cat and Flow Master 40 and i love the combo, its rugged and sounds good without being obnoxious. lost the whole thing cat and all on the highway one day, dont ask, dented up the cat but didnt break anything inside, bonked it on rocks too put at least 50k on it, just passed DEQ a month ago. Plus I got the whole combo super cheap on ebay linked it all together with exhaust clamps and run a turn down right after the muffler. Later took it to an exhaust shop to have them weld it up and they only charged me $15.
1993 Jeep ZJ. 4.0