Patriot-Jett .50, YS .45, or Rossi .45??
I fly mine with a Sport Jett .50 / SS muffler option.
Super power, very user friendly operation.
Hard to beat the performance unless you go to a 'big block" .60-90 size engine.
Never the less, the Rossi .45 is a very good engine. If you have one, and can get it installed.... go for it. You can install the Jett super sport .40 muffler on that engine as well, and it will sing nicely.
Bob Brassell