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Old 02-10-2012, 01:32 PM   #2
boost junky
Join Date: Dec 2010
Location: Linden, NJ
Posts: 548
My Ride: 02M3T, 97M3T
I would recommend making a plenum. If you choose to use the stock airbox I have some recommendations for modifying it for boost.
02 M3 - Maximum PSI S2 turbo kit - 10.43@135.81, stock motor, stock ecu
97 M3 - Maximum PSI turbocharged - 9.16@163.37, first in the 9's
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