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well what headers did a pre-facelift EU N52 use then? because either way, both of them look like 215hp for the 325 and 255 for the 330i. If the part numbers are different and they supposedly flow better why is there no real difference in output?
I tried cross referencing all of the face lift N52 manifolds for the European market and none of them show up as ever being used here, so the assertion that the EU market switched to US headers and lost power appears to be false.
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