Thread: HFM purpose & delete
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Old 05-10-2005, 10:24 AM
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The stock one is 3in diameter. Dinan's isn't a Dinan part, its just the euro HFM (same part as the 540i HFM) relabeled as theirs. That one is 3.5in diameter.

With bigger injectors and proper software there is a good power gain to be had.
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