APR Iridium Pro Spark Plugs

Featuring one of the strongest available materials for this type of product, APR Iridium Pro spark plugs help provide an ideal upgrade for tuned engines. They run cooler, resist pre-ignition, last longer than other materials with higher melting points, and require less voltage to produce a strong spark. The electrode is harder and stronger than other materials; can dissipate heat more easily; and is better protected from melting, cracking and other limitations found with standard models. These plugs are designed for use on tuned and high-performance vehicles that benefit from a 'cold' plug. They also pair nicely with APR ignition coils, where applicable. Order the APR Iridium Pro spark plugs recommended for your vehicle. Other features include: * Heat range 9 (similar to Bosch 3, Brisk 10, Denso 27, and NGK 9 ranges) * Melting point is higher than platinum (38 percent), copper (125 percent) and silver (152 percent) * Available in non-projected and projected insulator designs * Optimized electrode design for hard-to-ignite fuels (ethanol, etc.) Show Less