I have found that by now if it can be done to a Rocket, one of us has done it. After I opened up the cat box, I said screw it and bought the cat delete pipe. Looks and sounds much better.
I agree, but since i survive (not live) in California... we're under
threat of new regulations. Periodic SMOG/emissions check that
includes looking for modifications to original equipment.
I pity those who will need to change back and forth between
jars etc... and original eq. every two years...