2.5L Iridium Spark Plugs

The COBB Subaru 2.5L Spark Plugs (D44700) are engineered for enhanced ignition performance in a wide range of Subaru vehicles, including WRX, STI, Legacy GT, and Forester XT models with the 2.5L engine. These are the same spark plugs factory-installed on the 2018 Subaru WRX STI Type RA and 2019 Subaru WRX STI, providing a reliable OEM-level component. Constructed with a durable laser-welded iridium-tipped center electrode and trivalent metal plating, these spark plugs are built to withstand demanding conditions. They feature a pre-set gap of .024 inches (0.6mm) and a heat range of 7, offering a one-step cooler temperature compared to some earlier factory plugs. This cooler heat range and tighter gap make them a suitable upgrade for modified turbocharged Subarus, helping to prevent pre-ignition and ensure smooth engine operation. These spark plugs are sold as a set of four, ensuring you have all the necessary components for a complete engine tune-up. While they serve as a direct replacement for specific factory applications, they are also highlighted as a valuable upgrade for enthusiasts seeking to optimize their modified 2.5L turbocharged Subaru engines.