I am stunned. I did not realize that this engine had been increased in size to almost double its size when I ordered it up. I thpught at first there had been a mistake made, but to my delight after investigation, read there was no error made. This engine is truly a work of art. It is a brute to be sure. I was very surpised that the exhaust pipes were 3D printed instead of formed of metal. I have yet to decide how to best mount this gorgeous piece of work. The quality is outstanding. Some research has been necessary as to running as the supplied manual, although illustrated and states various specifications, does not really delve into specifics. I wish that it came with a generator to fill the hole that is very apparant on the forward part of the crankcase... I am delighted otherwise and can assure others this is a true find in terms of realism and value.