Yea...I plan on getting the OS 15 for it, should have lots of power then. I have always liked the OS engines, that is all I run in my helis. I asked Chris at Traxxas if the stock trans and diffs would handle the power of the OS engine, he said it wouldn't be a problem. I have to turn the diffs around, now all I have to do is talk myself out of installing the aluminum diff cases and trans case while I have it apart.. ...Coop