It seems to be a spec for the Chinese market (likely for emissions or noise reasons):
http://www.1addicts.com/forums/showthread.php?t=719739
http://www.1addicts.com/forums/showthread.php?t=711749
http://www.1addicts.com/forums/showthread.php?t=714642 (that thread got out of hand)
You could call it some sort of "Tesla tune".
