i got a two brothers full racing exhaust system, mint condition, great sound, super light, it comes with a racing header and a aluminum canister.
if you go to the http://www.twobrothers.com/ site you can find it under the Honda CBR600F4 SS Header with C4 Aluminum canister.
part # Part Number: 005-860117 .
it retail for $669.98 US and i'm looking for $500.00
pm me if your intersted or if you want to see it.