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horsepower gains

  1. Best modifications for pure horsepower gains?

    E39 M5 and E52 Z8 Discussion
    Hello all, I am just getting into the forum game because I really want to know everything about my car. I did a few searches and couldn't find a thread on this exact topic. So the question is pretty simple. What modifications would you all recommend to solely boost the horsepower of the beast? I...
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