Someone on Ebay has some for sale. I do not know them just seen the add.
<a href="http://cgi.ebay.com/ebaymotors/stock-mufflers-for-a-2001-hayabusa_W0QQitemZ220070684937QQihZ012QQcategoryZ35596QQssPageNa
meZWDVWQQrdZ1QQcmdZViewItem" target="_blank">http://cgi.ebay.com/ebaymot....iewItem</a>
<a href="http://cgi.ebay.com/ebaymotors/stock-mufflers-for-a-2001-hayabusa_W0QQitemZ220070684937QQihZ012QQcategoryZ35596QQssPageNa
meZWDVWQQrdZ1QQcmdZViewItem" target="_blank">http://cgi.ebay.com/ebaymot....iewItem</a>