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This was stated about the 5th gen as well. The fact is if your going to Mod then do it. Tuning the car ecm only for a little bit of power is just not worth it. Gm finds any way possibe to wiggle out of warranty, and I have seen a powertrain void for a catch can install. Thats a complete powertrain void.
If your going to just tune the ecm I would need some very concrete proof that they are not full of it. They need to show proof of this, not just say it. Gm is not stupid with this. A lot of people blow things up with poor tunes.
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