BMW N45

N45B16 Applications: • 2004–2011 E81/E87 116i • 2006–2009 E90/E91 316i N45B20S The N45 was enlarged to , to homologate the E90 320si for the World Touring Car Championship. The N45 was chosen over the N46, because its lack of variable valve lift allows higher engine speeds. Instead, the engine used dual overhead camshafts and 16 valves. The main visual difference is the carbon fiber valve cover. Applications: • 2006 E90 320si (Limited production model) ==See also==