Exhaust bypass valve

Discussion in 'Technical Q&A' started by coolblue, Jul 1, 2004.

  1. coolblue

    coolblue Karting

    May 6, 2004

    Just got my new F355B and its making me feel like schoolboy again, only problem is that the exhaust bypass valve is missing. I have got from an archive search that this is primarily to make it louder. My mechanic tells me that it can cause it to fail the emissions test of the MOT examination. He also tells me that you can block off the silencer to pass the test. My question is "is this true?" also, how much do they cost?

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  3. tbakowsky

    tbakowsky F1 World Champ
    Professional Ferrari Technician Consultant

    Sep 18, 2002
    The Cold North
    Full Name:
    You will also loose bottom end torque with this valve removed.
  4. yfc

    yfc Karting

    Dec 23, 2003
    Geneva / Switzerland
    Full Name:
    Hi coolblue,

    I got last week some problems with my by-pass valve. Mine was sticking in the full close position. The consequence of that was the blinking "Slow Down" warning light.

    By the way, where has your car been serviced (country, Ferrari vs non-Ferrari dealer, ...)? Just a bit currious about that.

  5. coolblue

    coolblue Karting

    May 6, 2004
    Thanks for replies, my car is being serviced in the UK by a non-dealer specialist.

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