[James Brown]

the oil will foul and might cause the converter to fail. if you can get by till the top end, that might save the cost of a converter. BTW, i tried a experiment with my 81, stock exhaust, euro muffler and regular cat, sport single in/out muffler. I did not see any increase in performance. A little louder with the euro muffler but thats it. the bad part of the system is the crossover and 6 into 1 headers that really choke the system. backdate would be the way to go. with a chip (3.2 i am guessing) and a good flowing exhaust will waken up that engine. the smoke only bothers the people behind you!!