Due to my local race circuits heavy restrictions for mid-week track use, I need to put a standard silencer on to my NC23 (STANDARD HEADERS)

I cant seem to find an original unit, if anyone has one or somewhere to look that would be much appreciated.

otherwise:

What else could/would fit, that would keep it below or at a standard noise level without being a specific nc23 silencer?

eBay and the usual suspects arent coming up with anything at the moment

THANKS

DB killer?

On my old 23 I had a carbon renagade can off a cbr900 on it, had to open up the holes a bit on the manifold to get it to fit properly but it did go on ok.