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  1. 06-07 LBZ & LLY Duramax Powertrain
    Hey Fellas, I just installed a cat to a 7 inch miter stack on my 07 lbz. I am pretty disappointed with the sound thanks to that good o'l tree hugger OEM catalytic converter. So I am real close to buying a front pipe to make it a turbo back system straight all the way. I'm new to diesels and how...