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When I bought my focus, it had mismatched injectors. I have no idea what brand they are. 3 are red, one is blue. The car is running fine, and I have no performance issues. I am, however, wanting to start cleaning up the engine compartment, and the mismatched injectors have to go. I am wanting to replace with stock Motorcraft injectors, but thought I'd get opinions on whether I should use those, or get different ones. I am not boosted or supercharged, and have no plans to do so. Steeda RAI and magnaflow exhaust are the only engine mods. I do plan on getting a tune at some point in the future.
 

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Sounds like it had one or three replaced at one point. The older Duratecs came with red injectors and the newer ones had blue. If your not having any issues I wouldn't worry about it.
 

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Without some form of F/I the stock injectors are more than good enough, plus you would need a tune to properly run any other injectors efficiently.
 
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