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Saand: personally, I wouldn't test this mod without a lab/dynomometer.
If the mod isn't easily & quickly reversible for A-B-A testing under identical vehicle, speed & weather conditions, it allows too much variability to creep in.
Same reason I won't test fuel/oil additives.
Same reason I didn't test the difference between my standard & XFi camshaft.
And I maintain: it's not our job to test his product. If he's selling something, it's his responsibility to provide credible evidence to the consumer. (...Or be prepared to move on if he isn't willing to offer the level of evidence the consumer asks for.)
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