Not Ranked
I looked at the website, and honestly it looks a little sketchy to me.
It would be trivial to have dyno charts before and after. 1/2 inch or whatever height carb spacer vs. their device before and after. But thats not what they have. Instead they have some dyno charts that look nothing like a print out I've seen (although I'm hardly an expert) that have speed in MPH as the X axis and not RPM. It also doesnt display air/fuel on their charts so maybe even if it does make more power its just running leaner. Hard to know.
If this was my company, and the product was legit I would to find 10 or 15 websites like club cobra, get 1 volunteer on each to try it, and pay for a before and after dyno session at an independent shop. Those 10 or 15 people could also report back on fuel consumption a month or two later and be fantastic inexpensive advertising.
Just my take.
Daryl
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