Im not sure where you can find the specs to you engine. They can probably tell you in the redcat forum on here though.

Id say the O.S. .18 cv-r would be a great engine for that truck. It will bolt right up to the stock exhaust system too. Or a 2.5 traxxas engine would also be a good upgrade that would make that thing scoot i bet[8D] Its only a .15 engine, but they are strong.

I had a 2.5r traxxas engine in my old t-maxx and it tuned good and had great power. I couldnt keep the front end of that t-maxx on the ground hardly So im sure it would be plenty in the lighter redcat. It is rear exhaust so you would have to get a different exhaust system.

Either of those engines would probably give you what you are looking for without tearing up the driveline. The next step up is a .21, and they use a larger engine mount, so that would require some extensive modification. If you are really wanting a lot of power and dont care if it tears up your driveline, look into an O.S. .18tz. They are mean engines. [8D]

Eric