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I don’t subscribe to the thinking in the Integra article either. If adding backpressure did anything for FE you would have seen throttled exhaust become mainstream decades ago. If you think that your exhaust is too free flowing my recommendation would be to change to a 1/4" smaller pipe from the manifold back instead of welding washers into the existing pipe.
It could be quite possible that in low RPM, economy load region that the gains are so small to be immeasurable as Frank says and definitely outweighed by the noise increase. Although nothing ventured, nothing gained.
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