whether Porsche, Silvia, RX-7, whatever, the same thing happens. BOV vents to atmosphere, computer sees a lot more air than is actually getting into the pistons, injectors spray too much fuel, get split-second lean condition, sometimes ignites in exhaust stream. same thing with any turbo car with any vented-to-atmosphere BOV with any cat-less exhaust system. RX-7s, Supras, Eclipses, whatever. same mechanical events occur with the same components.
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