Mufflers Without a Drone

Dynomaxs. 3in3out,offset 1 end. No drone. Not to loud to cruise 2400 to 3400. Not to loud at WOT with 360 and 10.7cr.They sound great when my son gets to working em.Screams at 7200. Well,not exactly a scream. Maybe a roaring jet engine.No thats not it either. Whatever it is I like it!