[TahoeM3]

If BMW put the S63tu in the M4 and added AWD it would be very competitive with the GTR. And it wouldn't require as much R&D as starting from scratch. The reason the GTR is a loss leader for Nissan is that it's completely different from all other Nissans with almost nothing shared. BMW could really benefit from using its big engine across platforms more like MB/AMG does. I'm hopeful that they will come out with an M4 variant with the S63tu...I think it would fit easily.