I appreciate the reply. I am not necessarily looking for the most power. I like smooth and easy to control. It just seems to often that the 9991/41021 is the go to setup on Nova buggy engines. If it is great, I already own that combo. But if there is something out there that performs more to what I want I will purchase it. I don't like super snappy bottom. I had always been told the 2096 is very smooth with good top. Of course I am looking for optimal mileage to. I can make compromises. Mainly want smooth power with good fuel mileage.