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I've never been a fan of deleting the cats since not only is it a federal crime but it's not really worth the effort in dealing with the impact doing so has on the ecu.
You already know what you have to do with that issue.
As for the rattling and vibration. Welcome to camaros. They vibrate and rattle. However, i'd expect any new exhaust to ping and rattle a bit when brand new as any metal that's not welded in the muffler that is close to other metal will vibrate until it's caked with soot after a few hundred/thousand miles. Mufflers do have a break-in period where their sound will "mature" and some of that vibrating may muffle out. However, the notes most aftermarket exhausts produce will lead to massive increases in body vibration in our cars, especially since the trunk area is a massive cavern of empty space and thin sheet metal with no insulation other than that molded felt interior. You can change exhausts or add dynomat all inside the trunk. Keep in mind, dynomat is heavy, as would almost all sound deadening solutions be.
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