My exhaust is one piece( 2009, all fairings removed), so do you need to cut it to use a slip-on like a Yoshi? Has anyone done this? I want to retain the center stand, it's a great feature.

yes the yoshimura trs slip on for the gs includes a connector piece- you have to cut the old pipe off and mount the new one according to directions.

http://www.yoshimura-rd.com/images/product/pdf/1150262.pdf

Perfect information, thanks so much!