Every shop/tuner I've ever dealt with have ALL said chassis-dynos (like Dynapack) read higher than say, a Mustang dyno (which is generally the opposite). You can find one-off's of proof on either side, but the point is moot. Peak HP readings do nothing but help you sleep better. It's the difference between tune/no tune that's important (at least the point of this thread - to show gains from respective companies).
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