I I R C I remember some/same thing this guy posted about some ezxhaust coating... first was a set of Spoerty hedders, then some fcktard azzhat on a new H2 Kaw.
I was at my buddy's house downtown, in the back yard, when I first swapped from the stock muffler to the aftermarket one, ( Wilyco ) I had removed the muffler, and just for giggles started my Cyclone with just the open header.
Didn't seem that loud. But I only started it and revved to 3500 or so, one blip, then shut down. Fire was coming out, and I didn't want to burn a valve.
Then in the ringing silence I heard branches falling from nearby trees and people yelling from quite far away.
Still didn't seem as loud as some bikes I've had roll past my house.
There is a difference in perception between the cannon fire of a V-twin and the ripping air of a IL-4.
When I finally got some miles on the 1190RS I put her on the dyno. Long story short, did a couple of runs with just the primaries. 155hp.. Her headers are pretty long but ear-shattering even with ear-pods... especially at 11.5 krpm.
Didn't watch the video but did sidetrack on a couple of P-51 Mustang videos.