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I compared some parts on Realoem. I am not sure how accurate this info is, but the pistons and rings were the only parts that had a different PN.
Intake, air box, and even the flywheel were the same on a 3/09 build N54 for the 135 compared to a 3/11 build N54 on the 1M.
But, as mentioned I don't know the accuracy of the information.
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13 Subaru BRZ, WR Blue, 6M
09 BMW135i, Alpine White, Sport, 6M - sold
99 BMW M roadster, Estoril Blue - sold
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