The 993 (all of them) had fully indepent multi link rears.
The Revell/Italeri kit is a (not very) modified 964 car so not much under the body is going to be correct.
In order to make a truly correct 993 car you'll want to rob the chassis from a Tamiya GT2 kit, which is a good thing because you're going to want to fit the Tamiya Carrera's wheels anyway, even though they're not also correct but at least they're the correct size.
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