I have seen one on a bike. It looks cool, and he liked it. When he left he got on the gas, it is pretty loud. If you want loud then it may be what your looking for.
Dirty bird concepts is the same as sinister industries. I've heard a few and they sound bad ***, but remember it's going to be loud riding because it's coming out the side.
i have only saw/ heard 1 in person on an orange RG looks sweet and sounds great. the guy's bag was all covered in black. i know that more of a tuning issue but just something i wanted to point out.
there is a member on here running it on a SG while back cant remember his name though