RE: Exhaust for a Kyosho 46VR with OS50SX engine?
Oh, by the way:
The hole in the middle of the muffler i actually a small tube straight thru the muffler which allows access (you have to use a long screwdriver) to the low end needle on the OS46 carburetor. On the OS50 it isn't really needed although it allows you reach the screw to adjust the angle of the throttle arm.
/Mattias