it's an ok motor. If it runs without much trouble, have at it. It would be cool if you could replace the carb with a "high speed" carb. That one has terrible throttle response.
iLooks like it was for a snowblower or something you are wither on the gas or off, carbs can be gotten off other motors, but sometimes whole motors are cheaper.
on that motor??? a banshee is 2 stroke so the pipe would be tued oddly for a 4 stroke but it could work as for onnecting it if the banshee exhaust is aluminum then i dont think so, just if you do weld it take the muffler off the engine.