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Originally Posted by highbrowed
did anyone ever get conclusive proof that the n54 had forged pistons? I recall someone attempting to contact Mahle to get a definitive answer but they required the part number on the piston itself, which nobody had at the time.
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Looks like BMW used forged pistons on the n54 in E9x, but I can't find any info about the E82 n54:
http://www.e90post.com/forums/showthread.php?t=541474