The IRS that they put in the Mustang a few years back was similar to the one used in the T Bird. It broke halfshafts at the drag strip, apparently. It wasn't a brilliant IRS, it cost more, and it was heavier.

The thing is, the Mustang isn't seen as a sports car by most of the people buying them. Repeat Mustang buyers apparently want Shelby references, live axles, V8 engines, and retro styling. The formula seems to be working for Ford, though, as they are coming up to 50 years with this model.

Ford's main SUV for years had an IRS, interestingly. OK, the Explorer wasn't exactly a Land Rover, but they can build an IRS if they want to.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue