Had my muffler replaced today. Was happy with Lukey so I stuck with them but picked up an Ultra Flo muffler instead of the Turbo muffler (straight through). The car no longer buzzes and the only change in terms of sound (from coasting, casual driving, aggressive acceleration, idle) is the volume. It is louder when under load(but not by much when in the cabin) but the tone/way it sounds has not changed at all; the idle noise from the outside has not changed at all either.