My state & county do i.m., sniff with a visual inspection as well.
My car ('03 S) has the cat delete pipes (deletes rear cats, leaves front in place). My car passed just fine, only because it may very well be the only porsche this station has ever tested. They're accustomed to me bringing in oddball stuff, and they admit to frequent having no clue what rotations equipment is SUPPOSED to be installed.... so the visual is perfunctory.... "cats? Check. Smog pump? Check. Ok, pass it".
Ymmv. But i'd find a shop that won't know it's missing the rear cats. You'll probably be fine.
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