The chassis is pretty cheap, the material is thin and stamped out leaving raised edges.
Somewhere along the lines Tra**as changed the engine mount slightly where one leg on the main mount is slighly shorter and one engine adaptor is also shorter. I had to file the engine adaptors to fit the massive OS pullstart just like I did on the Nitro Sport.
I also had to modify the chassis slightly to make it fit.
Engine mount and engine test fit to the chassis...