Hindle headers for the FZS 1000 (Gen 1) were available from PDQ in the UK for £299 inc postage.
I have a set in my garage, with a Akrapovic Ti can, in case I ever have any EXUP problems.
I did purchase a full Akrapovic system on here, but sold it on as you can't use the main stand with it fitted, but you can with the Hindle
.