  What Size Fuel Injectors Do I Need?
Fuel injector sizing is a little bit complicated, but a general rule of thumb is that you need an extra 100cc of injector flow for every addtional 75 hp at the crank. That means if you want to go from 227 hp (stock WRX) to 300, you'll need to go from stock 440cc injectors to 550cc. For 150 hp over stock, go with 650. 225 hp over stock, choose 750cc injectors.
Note that we're talking CRANK horsepower numbers. If you want to figure WHEEL horsepower, multiply by 0.8 for a rough wheel horsepower number.
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