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tuner gmc

  1. New Member Introductions!
    Hi everyone, I just got my new truck lifted with 37's, and was looking for a good tuner. I see that there are a bunch to choose from, so wanted some input on what would be best. The engine is a 6.6L Duramax Diesel, and looking to adjust the speedometer, gain some HP and gas mileage also. Any...
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