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The big heartburn everyone seems to have with the K&Ns is oil trashing the MAFs (correct me if there is another heartburn I don't know about). Oil would be a non-issue with the M3 since the S65B40 doesn't use MAFs.
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'16 F30 340i xDrive 6MT Melbourne/Black
'08 E92 M3 6MT Jerez/Speed Cloth
'18 F80 M3 6MT SO/CSAT |