Platinum Spark Plugs (AP24) by Autolite®. With Resistor. Want to upgrade the ignition system of your vehicle to get ultimate combustion and maximum horsepower? Step up to Autolite. Featuring the ground-breaking design, this product guarantees to deliver quick starts and provide peak performance. It was fabricated from novel materials with the help of up-to-date equipment to offer you the latest in quality and value.