When I was walking around the Nats, I was paying attention to the sounds of the exhaust of cars that were driving around as I am going to be putting exhaust on my car soon. Occasionally I would hear a car that the exhaust tone had a kind of tinny, metallic sound rather than a typical deep sounding rumble. I have had Flowmaster, Magnaflow and Dynomax mufflers in the past and none of them had that metallic sound which I kind of like. I never got a chance to check out any of the cars that had the metallic sound and thought I might ask here and see if anyone knows what type of mufflers sound like that.