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egr for dummies

  1. 04.5-05 LLY Duramax Powertrain
    so i have a efi live tune that has my egr shut off and was wondering if i still need to block it or not? i dont really want to because i live cali and would rather not. what do u guys think? also i believe it is leaking a little oil from the egr as well just a little sepage nothing bad
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