The E36 M3...a favorite of mine and one hell of a car
We have a 1998 BMW M3 sedan yellow/black 5spd and it's a blast. I can think of fewer sedans that match its overall "carness"
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Regarding the euro-spec conversion:
It's been a few years since I researched this, but I know you'll require more than just the intake manifold. If you wanna do this, make sure you're in a state that doesn't do smog testing. You'll need the euro exhaust with the different catalytic converter. You'll also need new engine software , and I think there are a few other things but I forgot them long ago
. Cost? BMW M engines are EXPENSIVE. The S14 engine in my father's pristine 1988 E30 M3 can fetch $9000 rebuilt. I've done some work on it and it's a complicated motor, much more so than the M42 1.8L in my 318i. I'd imagine the parts and labor for such a conversion on an E36 M3 would cost more than would be worth the effort. Fantastic choice in automobiles, though, it's difficult to do better for the money. The smiles to dollar ratio is very high!