I just ordered the Primo, that the same thing as the MoAss option? I ordered the 40 size, I know the OS55AX is a good choice, but I already have a YS 45 side exhaust on the shelf (almost new), and I have stock and tuned pipe for it. Do you think this YS will be enough to pull out rapidly? I'm used to flying a UCD with a YS110 4 stroke, so I'm pretty spoiled having all that extra power.