I chose this plug because its the "sport" version of the plug it came with. I know glow plugs tend to die quickly when your breaking in a new engine, so I figured there is no reason to pay the extra money for the "Super" version, when its going to die anyways. So i just ordered two, and now here i am with 23, because the stock one did die. Im gonna try them out on my trucks, and see if maybe I can use them for that and for this plane. And when I do get a new plane, I guess ill try and test them.