APR Ignition Coils are designed to be a direct plug-and-play upgrade to factory coils, and provide greater energy output, ensuring a stronger and more consistent spark. It's commonplace replacement of factory ignition coils with those taken from the higher output vehicles as they are often believed to provide greater energy output. However, testing often proves that they are no more powerful than the factory coils they are replacing. APR Ignition Coils increase energy output by up to 17% over stock. They are a direct upgrade or replacement, and come with a unique red housing! Sold individually.