I recently acquired an HB .25 It seems to be finely engineered. Couple of questions.....what reputation does HB have? Any idea how it might compare to my OS .25 FX? The back of the engine is totally flush, with no part of the engine extending back, and it has mounting holes both for an engine mount, or you can mount it directly to a firewall. Would there be any advantage or disadvantage to mounting directly to a firewall? Seems like weight distribution might be a slight consideration...anything else? Wondering if you might have more or less vibration. What do you think?