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An extensive study on the Variable Resonance Induction System used on the K-series is made. It bears the title "Mazda New Lightweight and Compact V6 Engines" by Takashi Sakono, Shinobu Takizawa, Setsuo Harada, Tatsuji Ikeda, and Hiroshi Abe of the Mazda Motor Corp. The study is released under the SAE 920677.
The document is found here