I have had this 69 Mach 1 for 6 + years.It is very loud,and the entire exhaust was new when I bought the car,but the previous owner failed to answer my repeated question."Are those flowmasters on there?"I have crawled underneath and have looked a few times ,but could never find any markings on them.Well last night,armed with a flashlight and more determination I squeezed under there,found the Flowmaster embossing on the mufflers and a number.Turns out they are 40 series 2 chamber.Every negative thing ever said about them is true.The Drone is beyond belief!!! There couldn't possible be anything louder or trashier sounding!! Now I have to find something that I can fit in there and has a good LOW DEEP sound.ANY SUGGESTIONS?