I believe they officially discontinued the hood insulation on 1 and 3 series May of 2008. Our 2009 128i & 335i don't have it.
http://www.realoem.com/bmw/showparts...57&hg=51&fg=70
This requires some modification to the underhood to properly fit the X1.
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Past: E36 325i, E39 540i, F46 323i (AA tuned), E82 3.0NA, E84/F30 N20 BMS Stage 1, E70 X5 N55, F06 N55