I wasn't prepared to pay $100 for a paper air filter from the local Yamaha dealer, so I gutted the paper from the old one which came out surprisingly easy and made my own foam insert. At about $18 for half a metre of filter foam it was simple and cheap. Two weeks on its working fine and makes a bit more induction noise.
I got the foam sheet from Brisbane air cleaner service in brendale qld. The seam is sown. I made it over size to fit in nice and tight.
Thanks guys, I'm going to re fit the fzr exhaust I have over Christmas once I make a better bracket, I'm keen to see what difference there is if any , it should sound good though.