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I haven't leak-tested by plenum but data logs don't show any weird values and the car runs perfectly. I've also taken the plastic elbow off and on a bunch of times with the new lip on the plenum opening and it hasn't moved a bit. This is after 6 months, so lots of heat cycles.
There is just one version of this plenum. It was tested on an E46 M3 during development, but also fits the Z4M. One thing to note is that the installation in the Z4 is much more 'compact' and there is very little (say 3mm) clearance between the plenum and the rear left corner of the standard airbox lid. I checked again last weekend and it is super close. No problem with an Eventuri, of course.
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