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1999–2005 Mazda MX-5 Miata Exhaust FAQ's

Please read our FAQs page to find out more.

What exhaust setup works for a daily NB without drone?

A resonated header‑back with a quality muffler deepens tone while staying civil. Many 1.8s run 2.25–2.5" depending on cams/boost and noise goals.

Do high‑flow cats pass inspections?

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?

Gains are real with matched intake/exhaust; standalone or piggyback tuning unlocks more when pairing cams or forced induction.