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So I do have a carbon airbox in my E46 M3 which is a little different. But I will say even with headers and an exhaust, the airbox is still very noticeable and really transforms the experience of driving the car. Driveability is also basically comparable to stock - granted I'm running the CSL DME software which can't be done on the Z4M (though IMO the MSS70 is actually much better suited for mafless setups, it's just harder to tune). It's probably also not impossible to get the MSS70 to work with a MAP sensor since its cousin the MSV70 can, but probably not necessary between the much faster processor and wideband O2s.
The gains are negligible if you get an airbox by itself, but if you're targeting big N/A power, then you need it. I recently got myself a pair of Schrick 288/280s, and that really woke up the car -- with the stock airbox I'd be flow limited at higher RPMs.
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