That just shows how little you know about engines in general and the G-62 in particular. Which is to say not very much.

At the moment the G-62 will still consistently outperfom just about any engine of smaller displacement. Pipe it and it gets even better. The stock mufflers that come with all the Chinese engines don't do much for noise so you might end up buying another muffler anyway. You can go to Mac's Mufflers in Sacramento, CA and come up with a very high performance pipe for what is not really much money for what you gain. You's spend the same or more to obtain a similar gain in performance percentages with any other engine.

G-62's are not just for scale. They are great performance engines as well but you have to know a little more about engine history and the hobby to recognize that I suppose.