I got the TR6's on my otherwise stock machine. The TR6's make the banshee twice the bike. Toomey will respond to any questions you got via e-mail asap. I don't feel it has the same bottom end torque as the stock pipes, but over all they're a great pipe. I just moved from western PA where you rarely get into 5th and 6th gear, but when you do, you'll think it's gonna mouse trap on you. On the other hand, I haven't run into a hill I couldn't I couldn't climb in 2nd whether it's coal, dirt, gravel, no matter how steep. I've had them on my shee for a full season with no problems. Although my experience is limited, I'd definitely recommend Toomey, no matter what pipe you get.
