I have no experience with any of the intakes (except flirtations with the aFe green filter), and am reading this thread for research. But I have to ask:
Who's to say BMW M Division wouldn't have come up with similar design adjustments over the years? At some point, every design has to simply stop development so that production can happen. And once the molds are made and the Kukas programmed, any design changes require a lot more than additional modeling, prototyping and testing. The aftermarket shops are continuing a process that BMW had to call a stop on in order to actually make the cars. As a designer, I can say that no design is ever completed; you simply have to stop and get on with production.