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  1. E39 M5 and E52 Z8 Discussion
    Ok, so i'm sure things similar have been posted about this but i'll post this again for us new to the M5Board. Ok, ESS tuning says up to a 150 horsepower increase is possible, first of all is this possible? Second of all, i'm 16 and although that seems young i've been working on my dads cars and...
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