I still have 2 with stock exhaust systems....not by choice, just haven't done anything to them because of the fact there is no real HP to chase there...but, I would like a little noise other than my S/C screaming....but that isn't a bad sound to hear either....
Max....my idea which I haven't tried yet was a rear cat delete, resonator delete, a cherry bomb h-muffler acting as a cross over, and another acting as my muffler with tips welded on.... I used a cherry bomb on my son's Mitsi that was lying around in my garage for years...and I was surprised by the sound coming out of that 4 cylinder....was hoping to repeat with the 6....we will get around to it someday...