The loudest pipes I have ever heard were the extra long epco drag pipes on Casey's bike (Clinton MD gang) and the others were the little shorty turn out pipes (basically a ten inch extension of the header pipes) that one of the members here in Northern Virginia has on his speedy.
I asked Casey about those -- they are (were) straight through without a single baffle... and yes, they are, hands down, the loudest ****** pipes I've ever heard on any of the Bonnie variants. Riding behind him is painful.
Still assessing the steel-packed Emgos on my 03 Speedy -- bike's in the shop right now, so little "testing" going on. They're loud -- perhaps a little too loud -- but certainly nothign compared to Casey's bike.
