That Volvo S60 has a multi-link rear suspension. Pretty decent setup out of the box. Heck the S60 would make for a nice IT car for the FWD fans. The mono-arm strut is the cool part. I believe the Super Touring BMW's used a mono-arm setup to shift the bending loads to the upper mount. Unfortunately in IT we can't reinforce the strut towers so a less than tank like structure may not see the gains of this design.

The beam or live axle, whether FWD or RWD, is pretty much open in IT. It's just a matter of going the extra mile to design and fab it up. A good example of this for a FWD car is the World Challenge Nissan Sentra's from a few years back. They had a 3-link rear end. Everyone bitched until they actually read the rules. Then they appreciated it, although most begrudgingly.

Anyone have examples of IT folks exploiting the beam axle section?