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  1. Best ways to add Horse Power to 2003 M5

    E39 M5 and E52 Z8 Discussion
    Hi everyone, I'm looking to purchase a 2003 m5 before the fall but i want to give it some more power. So I would like to know what you think is the best way to get the m5 to around 450-500 horse power. Ive been doing some research on aftermarket parts and so far a performance chip and a new air...
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