I normally hang out over in the M50 forum, but wanted to ping here as well, since the pipes will fit a C50 as well as an M50.
Long story and pic is
here in the For Sale forum. But the short story is that I wanted louder and nicer-looking pipes than stock, and went for a set of Hard Krome American Classics in their really cool black epoxy finish. LOVE THEM. But I start up at 5 AM, and as my neighbor Ernie (a former rider himself) says, "those pipes are 8 AM loud, not 5 AM loud".
In the interest of neighborly relations, I swapped out to a quieter set of pipes as a compromise, and have my American Classics (with 72 miles on them) for sale.