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What ever floats your boat I guess. If I wish to spend my money on a relic of an engine to produce higher HP than it was originally designed to do, it doesn't make good economic sense, however that's where the satisfaction comes into it, to make that sort of power. The money can mostly be attributed to quality components, machining time and treatment processes such as Nitriding, in the interest of reliability. Things you do for naturally aspirated. Bang for buck however, its a more viable option to fit a snail to the side.