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2006–2015 Mazda MX-5 Miata Exhaust FAQ's

Please read our FAQs page to find out more.

What exhaust setup works for a daily NC without drone?

A resonated header‑back with a quality muffler deepens tone while staying civil. 2.25–2.5" tubing suits most NA/2.5‑swap builds; FI may prefer 2.5"+.

Do high‑flow cats pass inspections on the NC?

Quality high‑flow cats maintain emissions performance in many regions while reducing backpressure. Check local laws and pair with proper fueling.

Do I need a tune after header/cat changes on the NC?

Gains are real with matched intake/exhaust; ECU tuning unlocks more when combined with cams, a 2.5‑swap, or forced induction.