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  1. 1.9/2.4 swirl flaps history/timeline

    Alfa 159, Brera & 946 Spider
    I am interested in finding out the timeline regarding swirl flaps and manifolds for the 2.4 and 1.9 engines. I have Googled, as per usual, but not really come across a definitive answer. Were the very earliest 2.4 engines fitted with swirl flaps? Did earlier versions have plastic manifolds...