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Philly is supposed to be plug in emissions, in which case they plug into your ODB2 port and "ask" your car if all its emissions are ok. In the PA burbs where they dont have plug in emissions they have "visual inspection" where they look under the to see if you still have a cat and look at your dash to see if there is a check engine light and then thats it.
So based on that, as long as you're not throwing a CE light code for emissions you should be ok. But if you get an inspector that chooses to visually look for your cats and doesnt see them he will fail you.
If I were you I'd get on the websites/forums/facebooks of local Philly car clubs and ask politely what inspection locations people in your situation go to and ask them to private message you where to go. That shouldnt be talked about in public so's not to get a nicer/more lenient inspector in trouble.
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