Hitec 81MG
I used to run the 81MG in my Speedmerchant.......the problem you will have is that it doesnt have enough torque to hold the line through the turns or it doesnt have the power to turn in from a high speed section........the car would always drift out thru the corners.
I put the KO 947 in and the car picked up a lap or so overall and I was able to dial a lot of dual rate out.
Just my experience.......