The L6 had a refrigerator in the hump between the rear seats. It was about the size of a six pack of cans. I'm not sure, but I think you could also get it in the M6 since the L6 was basically an M6 but without the M6 engine. I know that it was cooled but I'm not sure if it would run with the car off. Way back when I had my 633csi, I was looking for an L6, and I test drove two that had this option.