Quote:
Originally Posted by toology
2006 325i had the same 3.0 six [N52], it was detuned version of 330i engine, 2007 328i is a similar engine [N53]
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The 2006 325 has a one stage intake manifold and the 330 has three stages and different programming.
The 2007-2008 328 uses either a revised version of the N52 engine (N52KP) or the N51 engine. The N52KP is ULEV (ultra low emissions) and the N51 is SULEV (super ultra low emissions). In the US, both engines are sold in some states, but most only get the N52KP. Here are the differences:
