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ecu- revozport have an e46 m3 software upgrade which claims to give 15hp, but costs about $1200. im not sure if its compatible tho. does anyone know if the m3 software upgrades can be carried over to the m coupe, i think i read somewhere they are not the same.
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You're correct. They're not compatible.
The M3 and the MZ4 have completely different muffler & mid-pipe designs so the parts are not interchangeable. You should also look into the Eisenmann exhausts (sport version or race version).
How about a cheap mod that greatly improves driving experience? Get the ZHP short shift knob. For anyone who's still driving around with stock shift-knobs, you have NO idea what you're missing out.