It's good to know that you had no problem with the DC2, cause the DC3 is pretty much identical.
I talked with parts guys at the dealership this week when we were installing my new Mopar Ground Effects kit, and their manuals don't say anything about incompatibility, either. And, if you have both the sub-woofer and the Sirius Radio installed, and they both still work - then it looks like it's not a problem. Thanks!