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This thread has been immensely helpful. I recently test drove a certified pre-owned 2019 I4 that had been tuned by the GMC dealership it was at before being put out on the lot. I've had a V6 as a rental, and this I4 was super fun to drive in comparison. Nothing wrong with the V6, but this tuned I4 was lightning quick, nimble, and just a lot of fun. It sold quickly and I'm sorry I missed the chance to buy it but I had just started looking. All these chip options are not for me since they void the powertrain warranty. I asked the dealership if they would tune a Camaro I bought elsewhere (I'm considering buying a leftover new 2019), and they said they couldn't without voiding the warranty. They'll only certify cars that they have on their lot. Does anyone else think this is an interesting option, or is this site mainly for people who want to do their own mods?
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