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Reply To: 2021 Sierra 1500 aftermarket part upgrades

December 8, 2022 at 9:24 am #737503
GM Fan
Participant

If i were you i would start with a cold air intake or at least a high flow drop-in air filter, Those intake fans don’t work. Then next i would do better spark plugs and then an exhaust. After that would be a handheld tuner which is going to be the biggest increase, but i’m not sure if that would void the factory warranty.

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