I run a full exh 3" TTI system with the Dyno-Max Ultra-Flows and I race it through the full exh. The car is actually not real loud for what it is when idling and cruising along. But it gets much louder when I lay into it hard like when racing. I love the Ultra-Flows as I did not want my 63 to loud as I can listen to the radio when cruising but I wanted top performance for racing since I never uncap it. You can here it here a bit idling after I start it in this clip. Ron

https://www.youtube.com/watch?v=bYIM2HLaOI4&feature=related