This 2.3-liter BMW S14 inline-four, removed from a 1988 E30 M3, has approximately 194k miles and shows excellent compression between 190-200 psi across all cylinders. Recent service included new spark plugs, valve cover gaskets, ignition wires, and fluid changes. It comes with its ECU and wiring harness, though throttle bodies, AC compressor, and power steering pump are not included.