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Old 03-10-2013, 01:41 AM   #3
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Join Date: Feb 2008
Location: Mountain Top
Posts: 6,469
My Ride: 2005 M3 Coupe
Does the 4 cylinder have the same bellhousing pattern as the 6-cylinder? If not, an E46 transmission won't work. Maybe an E9x transmission if they have 4 cyls with 6-speeds. Nonetheless, as BlockedOut said, it won't be worth it. The small savings in gas will not pay for the mod for several years.
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