Sounds obnoxious like the old MBRP cans did to me, but its hard to tell from the quality of the video.
They also have a trail can. It will be just a little loader then stock. Below is info GGB did on a test:
Our tests were taken 3 feet from exhaust outlet at a 45° angle back, 1 foot off the ground. Unfortunately this is not how the SAE or enforcement perform the test but it gives a comparison. We will perform proper tests this winter.
Tested - 2012 RUSH 800
Idle 3500rpm (just before engagement)
Stock - 86 94
GGB Trail - 90 97
Mountain - 91 104
The Trail can will meet SAE J-2567. The Mountain can will not.
SAE standard test 88 decibels
*Jan. 2004 SAE J2567 stationary test overview: The sound meter microphone is placed 4 feet above the ground, inline with the exhaust outlet/center point of multiple exhaust outlets, on the side of the snowmobile toward which the exhaust is directed, 4 meters distance from the snowmobile longitudinal centerline. The operator holds the brake during the test, starts and runs the engine up to normal operating temperature, then slowly opens the throttle until a steady 3,750 to 4,000 rpm is achieved for not less than 4 seconds. The test is immediately repeated and the two readings averaged