Flow Force Injectors FF610 - Set of 4 Flow Matched 640cc EV14 Bosch Injectors with PNP Kit for Mazda Miata Cutting edge Bosch EV14 technology  the same injector powers the 662hp Shelby GT500 Flow matched within +/-0.5% static, and +/-1% dynamic flow rates for a smooth idle even on small engines Unaltered Bosch tip for better atomization than Injector Dynamics Works with multiple fuel types, including E85 All necessary adapters included for your Miata  just install, tune, and drive! (aftermarket engine management, such as Megasquirt, required)