F6Dave, thanks for the information! I knew about paint,tranny issues but did not know exhaust changed. I have never heard an 1800 Valkyrie yet, but will try and see if I can find one to listen too.
The 13 B I have is nice and quiet but when I open it up it growls a little, I compare it to my 1500 Valkyrie with a Viking Exhaust, so my "drone" calculations may be skewed a little.