This is a great question. But if your going to mod a car at all I'd go for the cheapest. Why? Cause usually parts and maintenance would be cheaper. A m3 I'd leave stock and track it every time I could. A n54 I'd mod the shit out of it and drag a lot and track a little. The n54 has a lot of little nagging issues but it is solid if you don't go super crazy and are on top of it. I'd take the n54 because it's a smaller investment not much risk. The m3 is pricier and if something goes haywire it's going to hurt you pockets! Worst case u can always find a 335 motor or trans easier than an m.
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