The intake reads 3.2/3.4 because (I believe) it's the same for both engines. The reason the car is named 745i is because BMW engineers estimated the power output to be equal to that of a 4.5 liter engine. When the engine was upgraded to 3.5 liters, the output I'm sure increased as well, but BMW already had great name recognition with "745i" so they left it alone. 7xxi sounded more in line with BMW's naming convention than 732 Turbo.