It can depend. Different weather conditions can really throw off one dyno from another. Also dynos can accept correction factors...so its possible the Mustang dyno was set to correct to "dynojet" numbers. I'd kinda doubt you are running too lean from this stuff. The ECUs in modern cars are pretty good about compensating for most N/A mods. You should have gotten A/F readings along with your dynos though, did they not do that?
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