I seriously doubt there is a bolt on option. If you want to do some basic fabricating on a new pipe mount, you can use an aftermarket silencer and mid pipe that will slide over your existing header. I put an FMF unit for an XR650R on my Traveller, then later added the racing header that is made for Skorpions by Projection Components. Sounded pretty nice after that but nothing compared to what it sounds like after the internal engine work.
These guys are in the UK and could probably tell you which can will work with their header, but I'm not sure if you are in the market to spend that much.
I've one of those headers but I've never good round to using it. They were designed and fitted round my actual bike strangely enough but it's still not fitted. The build quality is top!
ETZ250, ts150, ts250, Other toys.....Trx850...Bonneville SE...Bmw f800gt bmw Rockster ...X7...GSX250KATANA ...TL1000