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in the 1990s we saw such improvements as high-pressure gasoline direct injection, which cools the intake charge as the fuel evaporates, allowing higher compression ratios for better performance and economy. The Mitsubishi Galant was first to bring it to volume production in 1996. Five-valve-per-cylinder heads had a moment, but Audi, Toyota/Yamaha, and Ferrari quickly retrenched to four-valve heads.