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The injectors are not a restriction. The restriction is at the other end but even that can be over come to a certain degree. There is a point where the fuel lines to the injectors become restrictive and then it's either bin the lot or fit a 5th and/or 6th injector/s.
I will have to have a look and see if i can find where i have read it. I 'm sure i've read it on a few specs on PF and FF for peoples cars. Maybe they are chatting b****x...