2" to 3" exhaust... Worth it?

Ott, thank you so much for sharing this video. David found so many things early on and I remember his MINI book very well. We were fortunate that much of our testing matched his. Cyclone Sonic Turbos were great mufflers and some of the other stuff he says on this matches what we found regarding muffler flow and sound control.
I feel honored that I got to talk with him and confer back then. It was cool to verify that what we were seeing was accurate in regards to what he was learning in similar tests but with different engines.