German automotive show GRIP took a tour of BMW’s vast car collection. These were projects were made either for the movies or for experimental reasons. Among the many vehicles they recorded there were three pretty unique engine swaps.
Project Goldfish
This project was created to test a SOHC 32v 6.7 L V16 prototype engine design that was based on a M70 V12 engine. The engine was installed in a modified BMW 7-series E32 and ran a six-speed manual transmission from a BMW 8-series E31. 
Embedded video starts at 3:28
For more information on this project please read OppositeLock’s article or BMW Blog’s article.
X5 with a Le Mans V12
This project involved running a 700 horsepower LeMans V12 in a X5 SUV 
Embedded video starts at 10:44
For more information on this project please read our previous article on the X5.
Z3 with a V12
This project involved running a 326 horsepower 5.4 L V12 in a Z3 
Embedded video starts at 15:48
For more information on this project please read OppositeLock’s article or Car & Driver’s article.
Source: GRIP Youtube Channel via CarThrottle via OppositeLock