Category: Automotive Parts and Accessories Review: When it comes to keeping your car running smoothly, one of the most important components is the spark plug. Spark plugs are responsible for igniting the air-fuel mixture in your engine's cylinders, which powers your vehicle. As such, it's essential to choose high-quality spark plugs that will last and provide optimal performance. NGK Iridium IX Spark Plugs LFR6AIX-11 are a great choice for those looking for long-lasting and reliable spark plugs. These spark plugs are designed specifically for SUBARU IMPREZA WRX STI models from 2004 to 2011, making them an excellent option for those who want to ensure that their car is running at its best. One of the key features of these spark plugs is their use of iridium, a highly durable and resistant material. Iridium is known for its ability to withstand high temperatures and corrosion, making it an ideal choice for spark plugs. The LFR6AIX-11 spark plugs are also designed with a platinum center electrode, which helps to improve ignition efficiency and reduce fouling. In addition to their durability and performance, these spark plugs are also easy to install. They come in a pack of four, making it convenient for those who want to replace all of their spark plugs at once. The installation process is straightforward, and the spark plugs can be easily removed and replaced using standard tools. Overall, NGK Iridium IX Spark Plugs LFR6AIX-11 are an excellent choice for anyone looking for long-lasting and reliable spark plugs. They provide optimal performance and are easy to install, making them a great option for those who want to keep their car running smoothly.