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The following is what I found for the Concours. There may be other systems but this was all I could find:
Holeshot:
http://holeshot.com/concours
Staintune (AU):
Staintune makes mufflers and collector pipes for the Concours:
http://www.ca-cycleworks.com/shop/catalog/kawasaki/img/805c2.jpg
http://www.ca-cycleworks.com/shop/catalog/kawasaki/img/805d5.jpg
http://www.ca-cycleworks.com/shop/catalog/kawasaki/exhaust.html
Motad (UK):
(downpipes / crossover / canisters)
http://www.pbase.com/elvin315/image/26408505
http://www.pbase.com/elvin315/image/22111419
http://www.motad.co.uk/category.php?cat=N-eta&manu=Kawasaki (GTR1000)
N-eta Series:
GTR1000 Complete system
GTR1000 Pair of Silencers
GTR1000 Pipes & Collectors
Predator (UK)
(downpipes & crossover as well as canisters)
http://predatormotorsport.co.uk/shop/article_PK45/KAWASAKI-GTR-1000-1986-99-(ZGT00A-)-ROAD-LEGAL-STAINLESS-STEEL-4-2-ROAD-SYSTEM.html?pse=apq
Rivco Mufflers:
http://www.pbase.com/elvin315/image/65657847
FYEX (OEM canisters covers):
http://www.pbase.com/image/26456612
http://www.pbase.com/image/26456613
Concours/Ontario 4-1 System by Jim Snyder.
http://inlinethumb31.webshots.com/43358/2242143010089415519S500x500Q85.jpg
http://inlinethumb39.webshots.com/42470/2427956940089415519S500x500Q85.jpg
Modified OEM Canisters:
http://www.pbase.com/elvin315/image/36672904
Kawasaki ZX10 Canisters:
http://www.pbase.com/elvin315/image/32981656
http://www.pbase.com/elvin315/image/32981658
http://www.pbase.com/elvin315/image/32981659
Hayabusa Canisters:
http://www.pbase.com/elvin315/image/45620062
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.
Ceramic Coatings:
If you want to improve the performance and appearance of the original pipes there are several ceramic coatings available. The coating improves the thermal efficiency of the exhaust system, the cylinder scavenging, and cuts the under fairing temperature.
http://www.pbase.com/elvin315/image/35553690
http://www.pbase.com/elvin315/image/32981655
http://www.performancecoatings.com/headercoatings.html
http://www.jet-hot.com/
http://www.hpcoatings.com/motorcycle.htm
http://www.zircotec.com/dir/11.php
http://www.hyperkote.com
PS: Cobra is out of the Sport Bike/Sport Tour market now. They only make Tourer and Cruiser exhaust now.