These specific fuel injectors are very popular among tuners as they flow enough fuel to prevent detonation at high rpm, and maintain adequate fuelling. We specifically use these injectors in our race engines as they are the most reliable and the most budget friendly setup available. They are high quality made and provide a consistent flow without hesitation.
They are rated at 42# / 42 pounds @ 2.7 BAR. In a BMW, which has a 3.5 BAR system, they provide approximately 47 PSI.
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