The proper spark plugs to be used with APR Golf R (IS38) Turbo Upgrade Software. Also recommended when tuned.

Upgrading the spark plugs with Denso Iridium IKH24, gapped to 0.024″ 0.002″ (0.6mm 0.05mm) with a change interval of 10-15,000 mi or 16-24,000 km is required for engine longevity and safety.