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Horrible gmpp tune
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07-11-2018, 08:24 AM
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appleman22
Drives: 2017 1ss 1le
Join Date: Sep 2015
Location: new york
Posts: 440
Actually it is backed by science. I have a dyno sheet from the previous owner showing a before and after. There is a 10-15 hp loss between the stock and gmpp setup. But thanks for your input!
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