IDK.

I gotta check it on Boy's Samurai too.

Maybe this will give you some leads:

http://answers.yahoo.com/question/in...6234351AAvEUOs

A different article gave more info on reading the vacuum to determine if you have a clogged exhaust & how badly it's clogged.

Since the Samurai is an 88 & will never be tested for emissions, I've been thinking about just removing the cat & putting a piece of pipe in place of it.