I may need to replace the engine in my 97 Z3. Thinking of going with a used engine. Is a M44 out of a Z3 the only engine that will set in or would an engine out of a 318i work. Just curious. By the way, does anyone know of any respectable used parts dealers around the country. I've tried to deal with one that was real shady. Luckily, I checked him out with the BBB just before I paid him and found he was very dishonest. Thanks anyway.