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      03-01-2013, 07:58 PM   #81
z4z4z4's Avatar
Drives: 2002 M3, 2011 Z4, & her 740Li
Join Date: Mar 2010
Location: mild mediterranean breezes

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The engine is forced to breathe through two tiny 29.4mm restrictors by homologation rules. .... Since the airflow to the engine is limited, the engine is redlined at a relatively low 8,600 rpm as there is simply not enough breathing to efficiently rev higher. (edit from last seasons M3 GTR description found here):

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