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07-23-2012, 02:58 PM
Drives: 2002 M3, 2011 Z4, & her 740Li
Join Date: Mar 2010
Location: mild mediterranean breezes
Originally Posted by
What sort of gains are we looking at here?
Other N54 downpipe manufacturers claim dyno results with
Gains up to 20hp and 30tq to the wheels.
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