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No, there's no FE BENEFIT from smaller pipes or more backpressure, it's just that putting in low restriction stuff yields no additional benefit over stock.
Having said that, it's possible for an engine to be "over-scavanged" if all sorts of things come together just right, but again for FE driving that's not going to happen. When it does, raw air and fuel are swept right out of the exhaust valve during the valve lift overlap period, so some additional backpressure could help limit that. But again, not an issue for what we're doing.
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