I just completed the install of this part last week….along with a Leo Vince exhaust. It definitely sounds better and removing the stock exhaust along with the chamber box inbetween the swingarm shaved off a decent amount of weight.
As for more GO, can’t really say. Technically, it should help the bike breathe quite a bit better, but as I am still far below the 600 mile break in period, I’ve been quite gentle on the bike, so not really pushing it enough to say it made a big difference. Regardless, I’ve had bikes with 140HP and with this bike pushing only 44 horses, I’m not riding this bike for GO. 🙂