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The FE's do have a flat spot in the combustion chamber, which works well for achieving quench. FE's also like a LOT of timing advance, quench allows for more of it with better control of pre-ignition which adds horse power. Or you could run "normal" timing with lower octane fuel. Either way, it's a win win. Anytime you increase the efficiency of a motor two things are going to happen: 1. Makes more power. 2. Get's better mpg.
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