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Mishimoto 12-14 Mazda 3 I4 Ignition Coil - 4-Pack turn14-oos DeatschWerks Bosch EV14 Universal 60mmManufacturer Part # : MMIG MAZ 1204 Market Description The basic requirements for a properly running engine are fuel, air, compression, and spark. Before increasing your engine's power, it's wise to ensure all maintenance is up to date and these processes are performing as intended. A weak spark from your ignition system can result in misfiring, rough idling, poor gas mileage, and damage to your catalytic converter, all of which hinder performance.