Check with Jardine, Supertrapp, Kerker, D&D. It's possible that any slipons for the Ninja1000R, ZX10, or ZX11 might fit the Concours with some modifications to the mounting tabs or brackets. I've seen Concours with exhaust canisters not specified for the bike but it's strictly DIY. Changing to non-Concours specific pipes is harder but anything is possible with enough blood, sweat, and money.