I was running a stock muffler on mine until recently. I bought my motor used. And it had a OS40FP remotor needle valve on mine. running 14x6MA fat blade wood prop. byron 10%nitro 20%oil runs great with setup. 9600RPM ready to fly

I have just now figured out a moosecan for this motor with some help of other people. but I swapped over to a magnum XLS91 remote needle valve and it works great too. same fuel but taching 10,500 ready to fly.

If you have a extra remote needle valve lying around try it.

also as someone recommended, don't use fueler valve, or filters in your sytems. Just use fuels dots.