WTT 2.93 or 3.23 LSD for 3.73LSD?

[iamsam]

3.73?
pfft 4.10s in my 5speed iX ;)

right, but your iX redlines at 6500 rpms. An eta redlines at 4500 rpms. See where you are in 1st gear in your iX at 4500 rpms, and pretend that is your redline.