Have a look at this 2015 Mustang GT custom dual-mode quad tip exhaust set up by M6G member derieuz.
This 2015 Mustang GT gets unique mufflers, quad exhaust tips and a custom fabricated axle back exhaust.
This required cutting into the bumper to make room for the 3.5″ diameter outlet, 2.5″ inlet exhaust tips. With a creative design that creates a true single inlet dual outlet muffler with vacuum controlled valves, this owner reports that his custom setup has zero drone.
Check out the VIDEOS showing off the deep exhaust note produced by this custom exhaust.