ive got an 84 318i. I have the m10 and the m20b25 out of a donor car. The m20 has 150k on it, but its coming from an auto car so i would still need to buy the trans and dif.. the m10 ive got has 110k on it, and is pretty much clean and ran well, but if i were to keep, i would obviously boost for more power. Opinions would be highly appreciated. Im just wondering how hard it is to swap the m20 in, should i take the whole front end out(engine,subframe, suspension) and swap it all at once, and how hard is it? or should i just do a minor rebuild on the m10 and boost is because its light? Thanks alot guys