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Mitsubishi Evo X (CZ4A) Ignition FAQ's

Please read our FAQs page to find out more.

What spark plug heat range works on a tuned Evo X?

One step colder than stock is common once boost increases. Tighter gaps help prevent blowout at high cylinder pressure—confirm with your tuner.

Are coil-on-plug upgrades helpful on the 4B11T Evo X?

High-output coils improve spark energy and reduce misfire as boost rises. Pair with quality plugs and verify dwell settings in the tune.

How often should I replace plugs on a track-driven Evo X?

Inspect after events and replace as needed. High heat shortens plug life; carry a gapped spare set for weekends.