Whether a high-revving four-cylinder like Honda’s K20 or a mighty V8 like you’d find in the Corvette of the day, performance engines in the mid-2000s were largely untouched by forced induction. From Honda Civic Si to BMW M5 to Infiniti G35 to Porsche 911, automakers of the day were becoming experts at enhancing production engines by making them spin faster and breathe more easily than ever. Naturally aspirated gasoline engines were entering their golden era, giving shoppers plenty of selection as automakers flexed engineering muscle on the world stage with some truly memorable powerplants.
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