Search for 'Full Exhaust'. Pretty sure Akrapovic, Hindle, and maybe M4 made full exhausts for that bike. They may sell you headers alone - I think Woodcraft/Hindle is willing, but it'll come down to 'is it in stock', I think.
A hammer and a two-foot 3/8" rod? No joke, when the 2004 ZX-10R was new, some guy posted an image of his cat-removal technique.U can always de-cat it yourself if you have the right tools. Kind of a pain in the asś though.