2008 Corvette LS3 (E38 ECU) MAF sensor + housing = 1878.3497 g/s @ 15,000 Hz

Opening up this ROM from here, you can see that the stock card style MAF sensor + housing flows 1878.3497 g/s of air.

This is significantly more than any of the 100mm MAF kits out there. Even looking at Lingenfelter's own calibration data for their 100mm MAF, one can see it only reads 1607 g/s @ 15,000 Hz. Look in the L4XXX section.

So why would anyone use an aftermarket intake on a 2008 Corvette?
Does anyone have the MAF housing diameter and/or cross-sectional area for one?
What's the stock throttle body diameter for this car?

Thanks.