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2024–2026 Ford Mustang Ignition FAQ's

Please read our FAQs page to find out more.

What spark plug heat range should I run on a tuned or FI S650?

One step colder than stock is common with added boost or heavy track use. Tighter gaps help prevent blowout at high cylinder pressure—confirm with your tuner.

Are coil upgrades helpful on higher‑power builds?

High‑output coils improve spark energy and reduce misfire margin. Pair with quality plugs and verify dwell strategy in the tune.

How often should I replace plugs if I track the car?

Inspect after events and replace as needed. Sustained high heat shortens plug life; keep a spare set gapped for your setup.