I highly recommend Graves Motorsports. You get the same system they put on their race bikes. They are a full Yamaha race sponsor and only make exhausts for Yamaha's, not like Micron or Jardine. They have to R&D all bike makes and models. Graves specializes in Yamaha, so you are getting the best sytem for your R6, hands down. Call them up and talk to them. Their support is outstanding and on the other side of the wall where you are calling is the shop for the Gravessport race teams. That says a heel of a lot more than any other manufacturer. Much like Muzzy use to be for Kawasaki.