This part is listed by BMW as BMW part number 11727838313 (11-72-7-838-313) and is described as Pierburg OEM Secondary Air Injection Pump for S65 Engine on E90 E92 E93 M3 (2008, 2009, 2010, 2011, 2012, 2013).
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BMW Fitments:
3 Series
E90 / E91 / E92 / E93 (06-13) > M3