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1990–1997 Mazda MX-5 Miata Exhaust FAQ's

Please read our FAQs page to find out more.

What’s the best exhaust path for an NA that I daily drive?

A resonated header‑back with a quality muffler deepens tone without drone. On 1.6 cars, a 2.25" system is common; 1.8s often use 2.25–2.5" depending on mods.

Will a high‑flow cat hurt emissions performance?

Quality high‑flow cats maintain emissions compliance in many areas while reducing backpressure. Always check local laws and pair with proper fueling.

Do I need a tune after header/cat changes on an NA?

On stock ECUs, gains are modest but real with matched intake/exhaust. Standalone or piggyback tuning unlocks more when combining cams or forced induction.