M10 Engine: 180
M20 Engine: 258
s54 Engine: 326
A s54 engine is still very expensive. A turbo m20 would make more sense financially. Nt only would you be keeping a bmw engine in a bmw, but you could make way more power with an engine that is cheap, readily available, and would still weigh less then an s54. That being said, i would love to put an f20 in a 2002, its as good as the s14, and you could run that sweet s2000 gauge cluster.