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  1. E39 M5 and E52 Z8 Discussion
    Just installed Supersprint manifolds and sport cats on 01 e39 M5. Initially SES light came on and several fault codes were generated. After two test drives, the SES light has not returned, but two fault codes have: Catalytic converter conversion bank 1 and bank 2. The vehicle is essentially...
  2. E39 M5 and E52 Z8 Discussion
    I just replaced my valve cover gaskets 2 months ago. The car seemed to improve and no SES light for 400 miles. Then, everything went back to the way it was, except that my rough idle when cold was about 90% better. I removed the plenum to try and locate a vacuum leak yesterday and did not find...
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