Mr 5.0 is right on , but about the mileage thing, the injectors shouldnt hurt mileage or add performance unless calibration takes place. you said you were going to get that done. if so , your mileage wont suffer from it, it will suffer from your driving style, heavier foot with more power usually, after all thats why we do these things, right! normall driving with proper calibration and 24#ers shouldnt hurt what so ever. till you step on it and reach the upper rpm scale.the bigger injectors are to keep up with more power, usally when you exceed the stock limits of about 300 hp. until there , no worse mileage should be felt, unless you install a big stinky camshaft. then your mileage will begin to suffer under normal driving regardless. that will probably hurt your mileage issue the most.
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