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Thread: Why do the come restricted?

  
  1. #1
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    mania's Avatar
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    Why do the come restricted?

    I was just wondering if anyone can think of a good reason why they manufacture more parts then necessary just to restrict our airboxes...


    Are we sure the trumpets don't actually aid airflow somehow?

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    DaveDempsey's Avatar
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    Generally the restrictions in the airbox are due to noise regulations for type approval etc. In some cases the restrictions are there to limit the power of the car. For example the older Corsa;s/Tigra;s with the 1.4/1.6 16v;s had a very very restrictive inlet on them in order to limit the power as the engines were producing more power than was wanted for where the engine was in the range.

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    I see! Noise would make sense.

    Thanks.

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