Anyone have one already? If so, what do you think of it? Thanks.

I have not tried one on a quad yet...But I did put one on my 4 stroke dirt bike.

The "q" model is a bit less noisy...But just a bit. And in order to keep it quiet, FMF says to repack after about 20 hrs. I would be repacking the thing every 2 weeks... I don't think I would do it for the price. But if you must..you must.

I sold mine on E-bay for a loss...still way too loud for me.
I can't wait until manufacturers learn how to produce quiet power...I think most of the world would agree...there is nothing worse than an obnoxious, loud bike.

I'm still shopping too but I found something interesting. Riva Yamaha (www.rivayamaha.com) sells a modified FMF powercore for the Raptor. From what they told me, FMF makes it (looks just like an FMF) to the Riva specs. They change the internals to get a more consistent power across the rpm range (they have "charts" too). I'm real curious about it but like I said I'm still shopping. Might be worth a look.