Most of the ones I see advertise as being for a group of years, for example 2002-2005. I would imagine there's been additional changes to the r6 by 2011 if our bike was based off the '04 engine. Would love to hear from those more versed in the differences as well.
This is so you can do your own thing but use the where used function on these sites. Keep in mind that color changes can make a new part number! 5SL-14602-00-00 YAMAHA EXHAUST PIPE COMP.
the pictures on that site dont seem to show a difference between the 2004 and 2007 headers , but i know the australian bikes had a big under cat box from 2006 at least , not sure if its the same in the USA