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EXP Jawa
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Pretty much every car with IRS have sway bars as well, S550 included. A sway bar acts as a torsional spring to help control the up-down motion of the hub/wheel assembly in a way that's connects both sides together, thus help regulate body roll. The bar itself is attached to the chassis and the ends are connected to the hub assembly. It really doesn't matter what the suspension configuration is, a sway bar is applicable if the chassis engineers want to use it.
scottpe
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FWIW, Ford refers to them as "stabilizer bars" (interchangeable term) in their various marketing info for the Mustang. Perhaps that's why you didn't notice the S550 has one...
Norm Peterson
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In a front engine/rear drive car with at least sporty intentions you pretty much have to, because the compromises involved with designing a suitable IRS without a rear stabilizer bar are less desirable.
Ford's use of the term "stabilizer bar" is industry standard nomenclature. You may see it shortened to something like "sta-bar". Near as I can tell, using "sway bar" (or possibly "anti-sway bar) as a synonym for "stabilizer bar" either originated with ADDCO back in the 1960's or was popularized mainly by ADDCO around that time. Roland deMarcellus' company.
A real "sway bar" has more to do with towing trailers than sports cars and corners.
Norm
souprmage
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Really, it's normally called an Anti-Roll Bar, at least where I come from.
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Your current vehicle has independent suspension and stabilizer bars. It does not matter which end of the vehicle drives the vehicle.