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An S85B50 in an E9X M3 would be pretty sick!! The engine is roughly 60lbs heavier than the S65B40, so I don't see it disrupting balance too much. The E9X M3 6MT does fit the S85B50 with no modification. What I am personally not sure about is actually mounting the engine and transmission into the car.
What I am curious though is about the engine management. Apex Speed Tech carries Pectel stand-alone units that makes literally any swap possible, but it would be awesome to see this swap done retaining the OEM DME. From my past research, it seems like getting the OEM DME to work with all the amenities is the biggest challenge amidst the whole swap.
You should pick up a wrecked E9X M3 with a blown engine and do the swap!!
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G87 M2 8AT | Black Sapphire . Black
F80 M3 DCT|Alpine White . Black Leather
E90 M3 DCT|Melbourne Red . Speed Cloth | My Build Thread
E46 M3 6MT|Silver Grey . Impulse Cloth
E46 M3 6MT|Jet Black . Black Nappa Leather | My Build Thread
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