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Latest BMW X5 4.8iS Spy Photos The old generation x5 4.6iS engine was 255kW and it was exactly 4.6 liter of displacement, however at the same time the 745i had the entirely different engine with the different output and redline. The displacement of 745i also was different - like 4.8 liters. If im not wrong the redlines on the x5 performance versions was also a couple hundreds rpm's later than on identical engine vesrions. Therefore, i really hope the new x5 performance version will get the special engine, thus i hope it will be tweaked and get more power than xdrive50i...whatever its called. Otherwise, i dont see the way bmw can compete with porsche and ml63 amg on the paper, not considering the driving, keeping in mind that paper shi*t is more importatant for most of the buyers nowadays.