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Ill chime in mine came from dealer with GM performance intake installed this dealer seemed very competent. I asked multiple times about tune and was told that is only for emissions and does nothing for power. They also had multiple ZL1's and 1LE's this dealer seemed to have it going on.
I spoke to the tech and he showed me a dyno chart with a 8HP gain at the wheels on a 1SS same car same dyno within 15 minutes apart.
They already had it installed and it only cost me an extra 300 dollars so I kept it on the car.
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