The two brothers exhaust on a 1000 is one of the worst sounding exhausts I've ever heard. On the bike it makes you deaf, and off the bike as well. Its extremely buzzy and harsh sounding, not deep or clean at all. When I go ride with my buddy with his 1krr with that damn exhaust I either ride in front of him or just ride with someone else because its that annoying. Plus it sticks out farther than most of the single undertail setups, so it doesnt look that great IMO. My reccomendation: Dont get that one.
<--- coming from someone who's actually heard/rode with that that exhaust.