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m5 upgrade rpi m3

  1. E60 M5 and E61 M5 Touring Discussion
    Hi, I picked up a used 2008 E60 M5 (~40K miles/Interlagos Blue color) a few months back. I traded in my good ole 2006 E46 M3 for it. I was wondering what are the first few things or most common things to upgrade? I've read about the RPI ram air stuff and/or maybe a chip upgrade. Are the K&N...