RallySport Direct carries a great selection of Ignition Coils for those of you who need to upgrade your ignition systems. If you have surpassed the limits of your factory coil packs with larger turbochargers with more boost, or stand alone engine management systems. Choose from major label brands that include the likes of Okada Projects, Cosworth, and Cusco. There are ignition coils available for the Subaru WRX STI, the Mitsubishi Evolution both the 8 and 9 models, as well as the X models. And you can get coil packs for the MazdaSpeed platform. A proper coil pack promotes smooth and consistent power delivery especially in the upper RPM range, and when you start doing moderate builds where the turbo gets upgraded and you're running colder plugs with race gas, then upgraded coil packs will certainly benefit your build. make sure when upgrading your coil packs, that you first install a fresh set of spark plugs, and spark plug singles. And top off the rest of your ignition system with a grounding kit.