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Usually, the site or whomever selling the injectors will give you a horsepower range of which the injectors will support. Easy as pie.
 

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"Honda Performance Fuel Injector Set 550cc / High Impedance These performance injectors are perfect for providing the required fuel for your turbo / supercharger or high horsepower project. They are a direct drop-in replacement for your factory Honda injectors. They are flow rated at 550cc/min at 38PSI, and can supply enough fuel to support in the neighborhood of 300WHp"

This taken from TunerToys.com ...
 

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i bought some Lucas 550cc dsm injectors from fuelinjectorclinic.com for $200 shipped brand new. I am planning on doing anywhere from 300-320whp on my build, so i hope like hell 550/560's will be enough!!! I posted about it before i bought my injectors and were told they would be. The dsm 450's are supposed to be good right up to about 280 give or take safely........
 
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