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Originally Posted by Token-Negro
Well in that statement must be the facts on why series is worse then parallel.
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The factory system runs the injectors in series, thus cyls 3-4 are on the end of fuel delivery. Aftermarket systems run parallel fuel blocks to provide equal distribution to all 4 cyls at the same time. With that being said, the factory fuel rail will handle the fuel requirements of most builds. What kind of build are you planning?