Other notable problems include turbo wastegate return spring failure and engine fires caused by EGR cooler bypass valve vacuum hose failure. Used in the E87 1 Series, E90 3 Series, E60 5 Series, as well as the X1 and X3 from that era, the N47 grew an extra turbocharger in October 2007...
On popular production engines plenum chambers are crying out for a performance upgrade, although a few manufacturers provide reasonably well designed plenum chambers. Fitting big valve kits, carrying out M67 port enlargement and head flowing will also lift bhp, and significantly will allow you to get...