Videos rarely if ever capture sound volume or quietness.
To get this post back on track, I agree with Stone88. The Hi-Flow Hurricane replacement muffler is stock like quiet and DOES make huge power. I've seen the track dyno sheets on one from an independent shop. On the 270 Hurricane race tune, this hi-flow muffler exceeds other straight thru mufflers and tunes by 5 track HP. According to one shop, that's like having 10 HP at the engine! As a follow up to the track dyno, it also thumped other tunes and straight thru mufflers sleds on the trail and drives away nicely, and they BRAG they make more power than 270 too. Just average Joe sleds out having fun, not mine.
I've yet to see ridable snow yet to get mine out. UGGGG! I will say the Hurricane hi-flow replacement is quiet on the stand for sure! I've had others on my Doo that were supposed quiet, but straight thru that I couldn't take without ear plugs.