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HPFP is pretty well known to be the bottleneck for fueling on the N55. The only real solutions on offer today are supplemental fueling via meth, throttle body injection, or port injection. No one offers an upgraded HPFP worth considering.
The S55 uses a double, parallel HPFP setup, but no one is working on adapting that to the N55, because port injection is cheaper (for the end user) and more profitable (for the tuners).
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