Are you sure about that??Originally Posted by Porscheman
BMW seem to disaggree.
Download and read this pdf.
http://www.google.com/url?sa=t&rct=j&q=bmw%20s63%20difference&source=web &cd=11&ved=0CCkQFjAAOAo&url=http%3A%2F%2Fwww.m5boa rd.com%2Fvbulletin%2Fattachments%2Ff10-m5-discussion%2F194817d1360766519-s63tu-engine-technical-training-s63tu-engine.pdf&ei=kfkAUuCUFunhygGqm4GwAw&usg=AFQjCNHxz 6xO6sJplVASvGVlRasjCtREDQ