Hope everybody is happy -- but I would like to know -for my own edification
whay is "tuned exhaust " a dirty word?
And
have you guys used a well setup tuned exhaust on your engines?
I know much info about resonant systems is really awful but try this - :have you ever experienced a modern Japanese performance bike? these are tuned setups and the power is simply brutal from low to full tilt.

Tuned systems on models can be setup to work just as nicely
My full tuned (full length pipe 80J ZDZ pulls smoothly from 900rpm idle to 6500-on a 27x10Mejzlic
that is more power than most engines 20/30% larger