Okay - Here's the deal - I just bought an 87 sammi - The previous owner cut out the cat and welded in a straight pipe - He may have also torn off any "extraneous" stuff on the engine, I'm not sure - He only used it offroad so it didn't matter - I want it to be dual use so I have to pass smog. 

I can get the cat replaced for $100 - What else do I need to check for on the engine as far as smog gear goes?  O2 sensor?  EGR?  Anyone have a list of these, or (better still) a diagram that shows where they belong on the engine?  If I buy a haynes manual is it in there?

Any help greatly appreciated.

Thanks

I found a Factory Service Manual for an 88 online in PDF format - Found a whole chapter dedicated to the Emissions Systems complete with diagrams and pics

sweet