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Well if history repeats itself as with the X23i vs. X28i engines the major differences ARE the cams and the manifold....When I had my euro-spec E39 523i I had to do basically what OP and others said and added an CAI, catback, and Schrick cams....didn't spring for the manifold due to cost and age of the car by the time I finished with some other mods (wheels, paint, custom stereo stuff).
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Originally Posted by ptack
SGM was God's color and has been recalled to heaven.
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