[JL8Jeff]

The 3" system would be more for trying to get maximum top end power which you're not looking to do. I think you would be better with the 2.5" system for your purpose. Even the V8 systems are necked down to 2-3/4" at the I-pipe connection so the rear portion of the system is most likely the same for both with just a different inlet size. My 2000 SS has the Random Tech cat-back and there is no drone or resonance at all. The muffler is a straight through with perforations to feed the passenger side tailpipe. You might want to look at actual muffler designs to help determine what might work best for you.