Hmm, I see. I would agree that low displacement engines make more power than ever, but only for FI engines. For NA 4 cylinder engines basically only the FA20 is hitting 100hp/liter (unless I'm mistaken). Also can't you eliminate a lot of the NOx emissions by forgoing direct injection altogether? I know DI by itself isn't responsible for NOx, but that DI's advantage is being able to run leaner and higher CR's - conditions that lead to higher NOx.
Exemption doesn't really explain the Ford Coyote engine. Mass produced and taps out at 7400 or 7500 rpm. Voodoo goes up to 8250, but that might fall under the low production run category?
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Current: 2023 GRC Circuit Edition, 2012 C63 AMG P31
Past: (2) 2000 MR2 Spyder, 2017 GTI Sport, 2006 Porsche Cayman S, Supercharged 2013 BRZ-L, 2007 Honda S2000, 1992 Integra GS-R
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