My opinion is it's impossible to accurately compare hp results when they come from different dynos. Especially different manufacturers.
That's something that I've heard from 3 different shop owners with dyno's.
I don't think most shelf chips are all that great either. I've seen the numbers posted on a back to back dyno run on a 98 Cobra. It picked up something like 2.5 hp with the chip, and the same by running it a couple degrees cooler.
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