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heard the fuel pressure is the same as the 3.0 but the volume is a bit less at WOT
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If what you say is true about the flow rates, then I would definitely replace it with the proper unit as you'll want proper fuel flow, especially at WOT. At WOT the engine is at max load, and with a lean condition (from fuel starvation) it could lead to increased combustion temps-->detonation-->damaged rings/lands.......even truer with that higher compression engine.
Hope the car is treating you well otherwise.
-Charlie