The stock STI fuel injectors flow 550cc of fuel or 52.4lb/hr. When modified by PERRIN? your injectors will flow 816cc/min or 77.81 lb/hr. Almost a 50% gain in fuel flow. At the stock injector flow of 550cc your Subaru will max out at 320hp-380hp (Crank HP) With the new PERRIN? modified 816cc fuel flow rate your engine now has enough flow for 480hp-550hp. Each fuel injector is precision machined to flow in excess of 816cc. Injector "on time" is not affected by modifying OEM STI injectors. A larger fuel pump than stock, preferably 255lph or higher, must be used in order to keep up with the larger injectors.
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