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Message: <blockquote data-quote="ichiwan2" data-source="post: 38583" data-attributes="member: 153">Originally posted by The Necessary@Dec 17 2004, 11:12 AM Go ask any engineer, no restriction is always best...Maybe it might work for (I'm assuming) carb fed e21, but for "modern" fuel injected cars, the pressure of the fuel stream is so high that I doubt some "swirling" air will substantially affect the mixing properties.Plus, if it really were so good and so miraculous, don't you think F1/WRC/whatever racing teams would be installing similar systems?  It was design for normal engines to improve efficiency.  F1 engines have been ported, polished etc, to achieve the same effect.  And at such high RPMs and speeds, the cyclone is not as effective.  It is geared more towards your standard engines which have been engineered with keeping costs in check, and operating at lower engine speeds.  And I do not think your engines have been ported and polished as standard - unless your car has been tuned already by the established tuners.And beware of imitation cyclones.  They are made of lower quality materials and deform easily - thereby increasing risk of obstruction.</blockquote>