Most of the time people are wanting to put 5 Gen cat-less headers on later model 5/6 Gens. Which should give a little weight loss and slightly better exhaust flow. What is your goal with later model exhaust going on earlier gen bike? (Which should fit if I'm not mistaken)
I've seen a couple of SS aftermarket catless ones for sale to fit 6th gen. 5th gen ones seem a bit harder to come by.