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The ISR Circuit Spec Exhaust for the Miata NA 1.6 is a single-piece catback-style option tuned for the original NA roadster. It clarifies the exhaust voice and supports throttle response in street and track settings without overselling gains. Built as a vehicle-specific replacement, it provides a tailored fit for first-generation Miata 1.6 models seeking a sportier, period-correct exhaust upgrade.
ISR Performance Circuit Spec Exhaust - Miata NA 1.6
