Nice, that is basiclly how i look at it toAnd no, thick wall is louder where it matters, out the back as the noise can not escape till it exits exhaust, thin wall or mild steel wrapped in heat wrap is quietist and the reason i went mild steel for my 4", just waiting for gearbox to arrive to finsih wrapping it
I had a Jap 80mm catback before this and this is a lot quieter, good quality mufflers make a big difference, Windsor Exhaust did mine and they custom made the mid muffler for me