The APR Ignition Coils (Grey) are a set of high performance coils designed to provide maximum spark energy and improved throttle response. They are made from high quality materials and feature an optimized winding design for maximum spark energy delivery. These coils are designed to be a direct replacement for your stock coils and are perfect for improving engine performance and reliability. With the APR Ignition Coils (Grey) you can expect improved throttle response, better performance, and improved fuel economy.