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Message: <blockquote data-quote="ALBundy" data-source="post: 436355" data-attributes="member: 15">AS many have advised, ur friend would be better off selling his 320i than to mod it. Many here have been onto that path before.  The N42 engine is actually a pretty efficient one, equipped with valvetronic and minus the earlier ignition coil, sludge and ECU issues, is actually a pretty good engine. In terms of fuel efficiency, due to valvetronic (lighter in weight) is definitely more fuel efficient than the M54. I would stick with the N42, but if the 6 pot bug bites hard, just buy a 330i <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>