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I used to have a diablo handheld tuner when i had a charger and it would save the stock tune when you installed a custom tune and was easy to return to the stock tune. But I've heard that GM can still see that a custom tune was installed even if the tune is returned to stock.
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2011 2SS/RS Borla S-type catback, CAI Inc. CAI, 35% tint |
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