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what are the restrictors on the 550 exhaust

Discussion in '456/550/575' started by robiferretti, Nov 6, 2004.

  1. robiferretti

    robiferretti F1 Rookie

    Oct 31, 2003
    3,252
    NYC area
    Full Name:
    rob ferretti
    there are butterfly valves on the exhaust of the 550. what purpose do these serve? they are only on the two inside tips.... can i remove them? :) seems like a restriction to me...
     
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  3. maranelloman

    maranelloman Guest

    They are controlled by vacuum. At low RPM, they remain closed, to promote torque. At high RPM & load, they open to promote flow & HP. Yes, they can be removed, for a much better exhaust sound at idle & low RPM.
     
  4. iceburns288

    iceburns288 Formula 3

    Jun 19, 2004
    2,112
    Bay Area, CA
    Full Name:
    Charles M.
    I thought they also made sure air didn't go into the exhaust during downshifting, which erases backpressure and equals less rpm? Somethin like that. Maybe that's BOVs...
     
  5. robiferretti

    robiferretti F1 Rookie

    Oct 31, 2003
    3,252
    NYC area
    Full Name:
    rob ferretti
    so are they beneficial to performance?
     
  6. Rifledriver

    Rifledriver Two Time F1 World Champ

    Apr 29, 2004
    27,086
    Austin TX
    Full Name:
    Brian Crall
    Yes
     
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