Here is the stock off a 2.2 .. There is a cat that comes down right behind the manifold then the rear 02 sensor. Not sure what the thing is in the middle as there are no sensors after it so maybe just a resonator or another cat for emissions. The pipe after that second thing gets tiny tiny.

heres the link

http://img108.exs.cx/gal.php?g=exhaust52gh.jpg

the middle should be the catalytic (sp) converter

nice pics. do you have some more of the car?

the rest of the pics are under the south central section post