I ran one all last year, loud as heck. But I loved it.
Honestly my 12 pro ran so good with it running PAR 12.5 head and CF can with the extra weight of spinning a camo extreme 2.5" compared to stock track and was still pulling 71gram MTX weights with 2g in the tip and 3 in the middle at 8150rpm. I know top end on a mountain sled is unheard of but my max recorded speed was 96mph. I have yet to see another Pro RMK that has seen anything over 86MPH on the recall screen. I am not a top end person or go out and shoot for speed but at some point she was hauling azz.
I am not even going to try anything else on my 14 because I know it worked well on my 12.
****The one problem I did have was if you look in the bottom of the CF silencer there is a washer welded right smack in the middle of the silencer. My washer/restrictor did come loose and fall out part way through the year. Caused DET issues when that happened.