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      02-13-2013, 05:30 PM   #2
MSPORTWORLD
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Drives: '11 M3 MW/FR - '12 M3 FO/SC
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The problem is somewhat airflow related.

The small turbochargers BMW uses delivers very quick spool-up but will never flow enough cfms to get the top end gains you are looking for.

Same story from the guys tuning the N54 (my experience)
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