I've got Clifford headers running into regular old mufflers. But, in front of the mufflers I've got a set of quick time performance electric cut-outs. Quite when you want to be and then loud as all He** when a noisy honda pulls up.
My $.02
1953 3600 w/ full pressure 235 "Quando Omni Flunkus Moritati" --If all else fails, play dead.