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  1. E39 (1997 - 2003)
    Anyone have any experience with, or thoughts on the AA Rotrex C38 Supercharger Kit. They claim 320hp when installed on the M52 platform. (Which seems optimistic!!) ECS wants $5495.00/US. From what I've been able to read, its a superior kit to the Vortech offering. I'm not interested in moving...
  2. E39 (1997 - 2003)
    anyone know of any supercharger kits for a 528i that arent a arm and a leg?
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