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1998 bmw 540i perf

  1. E39 (1997 - 2003)
    Hey everyone, I have recently purchased my first e39 and really have no clue where to start performance wise. I have owned several e36 m3's and have went crazy with those. I honestly dont know where to start with my new 1998 540i six speed. So far i have upgraded the intake, exhaust, and 19 inch...