Originally Posted by RRT vette
Time to take the cat off and inspect.
I'm guessing this is a 84-91 since you stated cat and not cats.
It's an '86 with true duals, it's the cat on the passenger side. I dropped the one pipe because some did make it to the muffler and i shook it and alot came out, maybe the size of a golf ball. I've been getting a sputter from one side after playing with different rocker adjustments and such so i'm thinking this might be the reason