BMW is giving its 5 Series GT crossover a radical facelift to help boost sales, especially in the US. Spotted undergoing testing, spy images of the refreshed GT have been captured.The model will receive a new front bumper with modified air intakes. In our spy images, the headlights and grille seem to be left untouched.IMAGE GALLERYThe model will lose its massive rear spoiler in favour of a somewhat more elegant rear end. No word yet on new engines or interior tweaks. The new 5 Series GT is expected to be shown at the Detroit auto show in January, 2013.