BMW N54 vs. N55 Comparison: Which One is Beter?
Learn about the history of these BMW six-cylinder engines, the differences between the N54 and N55, and which one you should get.
Differences Between Tuning Potential High Precision Injection Piezoelectric Fuel High Pressure Fuel Injection Bosch Solenoid Valve Fuel Injectors
Source: bmwblog.com