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I voted n54 but there are so many things to tray first.
Do the n52 engine mods first. N55 is pain because of the wiring. Trust me been there done that. The N54/55 is more than you think because 128 has small spline rear axles, different trans, diff, rear brakes. S65 = deep pockets and almost worthless without going 1m clone.
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128i Msport, 1M3=1M clone +S65=  N55 swapped former 128 slicktop, former 128 slicktop with N54T swap |