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rebuilt engine

  1. E39 M5 and E52 Z8 Discussion
    Hi guys, I have a 2000 e39 M5 with 40k on it (I have 3 other vehicles). I put in a tubi exhaust to replace a rotted out stock, upgraded to MKIV Nav and put in a bluetooth kit (BimmerNav). Been very happy with the car. Recently, I began hearing a knock, which I recognized from my early car days...