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Message: <blockquote data-quote="ReplicaR" data-source="post: 274896" data-attributes="member: 9209"><p>I've personally seen hypertech lose power on the Dyno. We had my friend's bolt on 95 Z28 on the dynapack, while using 91 octane (california, what can you do). First he made a stock tune pass and he ended up dynoing 265whp. Then we flashed the hypertech power programmer, and did another pull. The car put down 248whp. I could not believe it. We did another pull. Again, the car put down 246whp. There was a noticable detonation up top in the rpm range. We took all of the Hypertech stuff off, and made a few more passes on the Dynapack. The car went back to making 265whp.</p></blockquote><p></p>