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There was a guy that actually tested these on an engine dyno. He stated it didn't actually increase the power on the two v8s he tried it on but it did move the rpm of the power and torque peeks. I'll try and find a link to his report.
The inventor did get a verifiable power improvement on a Briggs and Stratton engine. However there isn't really much optimization done by Briggs and Stratton on their engines so its not much of a surprise.
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