F54 Clubman | 2015 - 2024 F55 Four-Door Hardtop F56 Two-Door Hardtop F57 Convertible Rumor MINI’s Prince Engine is Dead. Enter the B37 & B48. According to Automotive News Europe and “sources” BMW will let the current agreement to produce the “Prince” family of engines lapse in 2016. While this isn’t a surprise (we’ve known for many... Sep 5, 13Sep 5, 13