Thread: 91k for a 550?
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  #52  
Old 07-15-2012, 07:16 AM
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AutoUnion AutoUnion is offline
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Yup, the N55 seems to have hit a wall in terms of tunabilty. Something that BMW seems to know because the 335is and 1M use the older N54 I6TT, instead of the uprated N55
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