I purchased this silencer for my 2002 YZ250. I loved FMF's dedication to 2 strokes and the idea behind making bikes as quiet as possible and that is exactly why I bought this silencer.
I am extremely disappointed with this silencer and FMF for that matter. For starters, it didn't even fit on my bike! I tried it on my friend's YZ250 also (in case my subframe or pipe was tweaked) and it was the same story. The silencer didn't even come close to lining up. So I was forced to start hacking on my brand new $$$ silencer which made me very unhappy. After taking off about 1/2" off the pipe and bending it upward, I finally got the silencer to bolt on.
I was anxious to start my bike up once I got the silencer on to see how quiet it was (this muffler is HUGE!). Noise is a major issue at the riding areas I frequent and I wanted to be a part of the solution by cutting the noise on my bike. Right away, I could tell that this muffler was no quieter than my worn out, oil soaked, PC silencer I just removed. Even after running it for awhile to break it in, there is really no noise reduction whatsoever from my old silencer. This was really disappointing because this muffler is about 3 times the size of the PC muffler on my bike before. Judging by size, this thing should be whisper quiet, but it is not even close.
The only thing this silencer has going for it is that it looks awesome on the bike. But looks alone would not push me to recommend this silencer or to purchase again if I had the chance.
For the money I paid for this, I don't want to have to hack away at a silencer to make it fit and then have it be just as loud as a smaller non-Q silencer. FMF needs to step up their game here.