The most interesting vehicle slot in the game, the Garage, has three different parts: The vehicle construction, the wheels and the engine.
The wheels and the engine have adjustable placement.
Being able to move wheels around makes sense. We can move the wheels more close or apart from each other, and we can make the suspension higher or lower.
However, I cannot figure out what moving the engine can do. I have encountered little changes in gameplay, but I don't know what exactly these changes are and how I can use them.