Sure fair to say its not cheap.. I managed to get a pretty good price for it and paid £530 Inc postage.. Still haven't got it yet though so won't recommend where I got it from just yet! Although their support is responsive
What year is your machine? 12 onwards you will need a full system.
I have an 09. Since i only paid 3600 for the bike I cant see myself spending more than 350 on an exhaust.