Mishimoto 2011+ Subaru WRX STI Single Ignition CoilThe basic requirements for a properly running engine are fuel, air, compression, and spark. Before cranking up the boost in your flat four, it is wise to ensure all maintenance is up to date and these processes are performing as intended. Weak spark from your ignition system can result in misfiring under high load driving, and spark blow out under high boost, which is bad for performance. Mishimoto is proud to launch our new lineup of ignition coils,