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pontiac grand prix gxp

  1. 08 pontiac grand prix gxp big 3 help

    Technical & Advanced Car Audio Discussion
    i have a gxp with the 5.3 v8 and i can figure out how to do the big 3 on it. i currently have a mechman 270 alt on it. this is my daily driver and it will soon be walled out with 2 xxx18s and a american bass 1100.1, but i will have to upgrade everything again before this. i currently run 2-...