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This month we examine the issues surrounding Piezo Injectors on BMW's N43, N53 and N54 engines. Words & Photography: Andrew Everett Ahot topic at the moment is that of the infamous Siemens VDO Piezo injectors fitted to direct injection BMW engines (and others) since late 2007 – these will be the four-cylinder N43 1.6 and 2.0 engines, the six-cylinder N53 and the N54 twin turbo six that arrived in late-2006 as the first proper direct injection BMW engines.