Porsche, Honda, Ferrari and BMW. Motorsports competition. The lightweight 911s (e.g., '73 RS 2.7 to the 996 GT3RS). For Honda: F1 in the 80s and 90's, ITR, CTR, NSX Type R, S2K and all of their 4 cylinder engines. For Ferrari... it needs no explanation. If you don't understand you CAN'T understand. BMW: M1, E30 M3 and all M5s (up to the latest Bangleization), the 3 and 5 series.
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