devilbikes.com is carrying on the special for zx6r exhausts that bolt right up to our bikes for another month. I just got one in the mail today, haven't even had time to open it up.
Filling out their online form doesn't work very well, but call 'em up and they're very friendly. They even offered me the oval exhaust at the discount, even though it's only supposed to be the round.
The prices are $275 + $15 shipping for carbon, $255 for polished stainless.
I think a few folks have devil exhausts already on their bikes - maybe they can comment on sound, quality, etc. It's definitely a hell of a deal!