Hopefully Ron will chime in on this one as well. it is an interesting conversation, Ron and I have been talking about it. His explanation will be better than mine but he is a BIG proponent of the Torque Arm and Solid axle for all round performance. His explanation was that "IF" you have the Aero downforce on a big track the IRS will be better "provided the geometry is correct and the toe steer is set up correctly. He was telling me how much improvement the Corvette Rear needs to work to its potential. if that is the case and discounting all the negatives listed above not to mention Exhaust routing. limited width options and on some cars the difficulty of being able to get the wheels on and off. Unless you HAVE to have it the Torque arm with a solid axle is probably the best choice.
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