Just thinking after reading all this.

A. I thought this noise ruling had been around for a long time, may be 20 years(ish).
B. Why is it suddenly, and currently an issue?
C. How many cars actually have an issue with it?
D. if, say, 5 cars at a meeting, with say 200 entries, are deemed to loud, them I guess they need a muffler. the other 98% need not worry.

oh and dont get me wrong i think that anything (rotarys excluded) should run a straight pipe