dual exhaust from exhaust manifolds back?

[frusciante fan]

since i'm getting my exhaust done early this summer, i was talking to my dad about what he had done with his '77. he said it was just 2.5 inch pipe from each exhaust manifold back, without any headers. would i be able to do the same thing with my '98? of course i would have the cat removed and would buy a dummy 02 sensor. do i just place the dummy sensor in the spot of the old one? would replacing it affect anything else, or do i just swap them and not have to work about it again?

[FirebirdGT]

Illegal