I am new to stadium truck scene as well. so I might be wrong. but, from what I heard and read, people use O.S. 12 TR, O.S. CV-RX, or novarossi mt12. I am thinking of putting in Sirio SP12TRP Standard though. just want to experiment with sirio engine. in my opinion, if you are new to the rc scene, it is not a good idea to get an engine that is turbo.
hope I helped you a little.