RE: Exhaust for a Kyosho 46VR with OS50SX engine?
I bought the muffler from a company here in Sweden, unfortunately they don't ship international.
But I found i here:
[link=http://www.modelhelicopters.co.uk/acatalog/MUFFLERS_PIPES_MANIFOLDS.html]http://www.modelhelicopters.co.uk/acatalog/MUFFLERS_PIPES_MANIFOLDS.html[/link]
Scroll down about 2/3 of the page and you will find it. They don't have a picture of the 46VR version but you can choose it from the drop down list.
Good luck!
By the way here is a picture of the aluminum exhaust gasket I mentioned earlier which can be found at quickuk.com. The OS50/OS46 version is the one in the middle.