Premium Denso Iridium Spark Plugs – SK20HR11 (3421)

Ultra-Durable Iridium Tip
– Precision-crafted with 0.4mm laser-welded iridium center electrode for ultra-long lifespan (2x conventional plugs) and consistent ignition under extreme heat (up to 1,500°C).
Exact OEM Fit for Toyota/Lexus
– Direct replacement for models requiring SK20HR11 (3421), ensuring factory-level performance in fuel efficiency, cold starts, and emission control.
Patented Tapered Ground Electrode
– Nickel-plated design reduces quenching effect, boosting flame kernel growth for 5% faster acceleration vs. standard copper plugs.
Anti-Corrosion Steel Shell
– Triple-sealed (glass, gasket, plating) construction prevents combustion leaks and withstands high-torque engine vibrations.
Optimal for Turbo/Sport Tuning
– Ideal for high-compression engines (including hybrid systems) in urban commutes, towing, or track use.
Global Bulk Pricing Advantage
– Wholesale-ready OEM-grade plugs at unmatched per-unit cost for garages/fleets. Ships in protective individual tubes.