This is almost certainly in the tune. If this install were to throw your trims off and cause some knock retard, then yes you may be seeing that situation. This is not all that common though. I highly recommend a custom tune, you will see a much better result in HP,MPG and driveability. I have seen a loss with some of these hand held tuners BTW.
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Tracey Scott
Lead GM Tech and Tuner -Cincy Speed
513-821-2221
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