The BMW M Performance division is part of the M GmbH (not some outfit in Atlanta)
They've been producing aftermarket components such exterior/interior trim/parts as well
as suspension, brakes and DME updates for the N55/N54
They are covered under the factory warranty as they are only sold by BMW dealers (and the DME updates can only be installed/updated by a BMW dealer as they require a code to be generated by BMW NA/HQ)
In German
http://accessories.bmw.de/internet_b...Stichwortsuche
and US
http://www.bmwusa.com/standard/conte...e/default.aspx