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what year, make , and model eclipse or just engine comes with 550s?
None of them did. The EVO 8-9 has 560cc injectors stock. Larger injectors aren't going to solve your problem right now. What ECU are you running?
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with the afpr at 39-40 when standing out of the car giving it gas the engine starts to flutter then smooth but if I bring the afpr to around 20ish it runs good with no flutter. thinking the afpr is bad?
Probably not the FPR. You have no way to tune the air/fuel mixture. By turning the fuel pressure way down, you're making it run leaner, so that's probably helping the flutter issue, but I wouldn't recommend driving it that way. Try putting a stock FPR on it, there's no real need for an adjustable one if you're mostly stock.