catalytic converters are over rated. put a "test" pipe in its place. LOL . if it is smoking out of the cat under the vehicle , like Jim said that would be loud. it could be exhaust valve seats or seals or rings. whew could be lots of stuff.

93 xj stroked 4.2 w/4.0 head avenger supercharged 6.5" long arm 35" buckshots rubicon 44's front & rear