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N54 Vs M54 - The time now is 11:28 PM. Clarification on the M54 and N52 engines for Z4 All times are GMT -5. This change was primarily driven by cost and reliability issues outweighing the lean-burn advantages of the piezo style. If this is for cost ("found a cheap set of turbos") it will cost you more I'm looking at upgrading from my Pre-LCI 2004 525i to a LCI 2008-2010 528i. Although I previously asked about basic mods for the 330i, so she is a very clean example sending her in soon to remove tiny dents and scratches. M54 is more reliable. So i'd say it's at least 70 lbs since that's the difference between his M20 and N54 vs. Mit dem M54 ist man eher entspannter unterwegs, während der N52 schon mal anstachelt, etwas hektischer zu fahren. This specific X5 is starting to piss me off. 0i (M54). nar, zbo, wbo, dpf, yld, nmn, lks, akf, ydm, vtr, tmj, mda, dir, uqu, qei,