The MY15 and MY16 exhausts sound identical beyond the less rattley valves. I've heard several in person as compared to my old MY15. No physical change to the exhausts themselves.
A lot of these comparisons were done with My16 exhausts that weren't broken-in as compared to My15 exhausts that were. This would reflect some minor differences between the two as well, but would be no different than a new MY15 compared to a broken-in MY15.
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