Interesting. One suggestion though. You might want to create a crossover between the two intake pipes (upstream of the filters). I'm not sure it's a good idea to have one path longer than the other on this application. It looks like BMW has gone through a fair amount of trouble to keep everything the same on the inlet side of the turbos, and I'd be hesitant to mess around with that.
I think a common intake on the inlet side of the filters would make sense. Other than that, the filters look good, and fit in there pretty nicely.
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