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  1. B

    Nice exhaust for my 03 duramax lb7 !?!?

    Going through the same problem also. Have done plenty of research via YOUTUBE and other sources. But really the best feedback I have gotten was from other LB7 owners and the set ups that they have. Have concluded that I will be going for a 4 inch downpipe back(MBRP or Flo-Pro)...