Here's my take:
1) You have to get someone to inspect that is willing to "overlook" the fact that you removed two catalytic converters. No cats, no sticker. You won't even get to the sniffer if that's noticed.
2) IIRC, the precats are there mostly for cold start emissions control. The main underbody cat is what cleans the exhaust mostly when the car is at operating temperature. So, just make sure the car is tested hot, or gets driven in a spirited manner for 5 - 10 minutes before it gets smogged for cleanest results.
3) Plenty of people have passed smog tests with the "mystery mod", but I don't know that any were on the "loaded test" we have. Most likely they were idle tests.
However, unless you are in the following counties, you won't need the smog test anway: (Southeast) Bucks, Chester, Delaware, Montgomery (me), Philadelphia, (Southwest) Allegheny, Beaver, Washington, Westmoreland. Oh look, I just realized that the chassis dyno test is only for the SE counties, and the SW area gets idle tests. Lucky me. Looks to me that Warwick isn't in any of those counties, so you're off the hook.
Caveat: Make sure you have functioning MIL eliminators. In the future, a larger part of the SE area (probably you included) will be required to go through an OBD-II test. Basically, if you have any CEL codes or incomplete monitors you'll fail the emissions part of the test. It's only a pilot for now, but it's meant to replace the smog test for 96+ cars at some point in the future.
Check it out:
http://www.drivecleanpa.state.pa.us/
