thanks
MacigRat for the reply.
Actually, I'm not sure if my cat is blocked or leaking. Care to take a look at it? (the cat on the jeep

)
a few observations:
1. I think this is the original stock cat (since 1987)
2. I don't know if it's blocked or not
3. I don't think it's leaking
4. The exhaust doesn't smell of rotten eggs yet
What do you recommend? Should i just have the cat taken out and replaced with a tube?