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

Please read our FAQs page to find out more.

What plugs should I run on a tuned or boosted NC?

One step colder than stock with a tighter gap helps prevent blowout under boost. Match heat range/gap to your tune and fuel.

Are coil upgrades helpful on NCs?

Fresh coils and low‑resistance wires improve spark energy and reliability, especially at higher cylinder pressure or with ethanol blends.

How often should I service ignition components?

Inspect plugs and coils regularly; heat and age shorten life. Keep a spare gapped set for events to quickly diagnose misfires.