Torsional rigidity is measured in in.lbs./degree.

And that's where my Crossfire doesn't measure up.

When introduced the Crossfire was touted as one of the stiffest chassis available. And mine felt that way at first.

But about 7 months after delivery it suddenly developed a road noise from the bottom rear of the driver's door. The door started moving around whenever the car hit an irregularity in the road accompanied by creaking noises in the roof above the rear bulkhead. It also started darting to the right when the right front wheel hit a dip or encountered a slippery surface.

Two dealers have made seven attempts to correct this problem without success.

I suspect that the spot welds that attach the body to the frame are failing.

I also suspect that a lot of the complaints about "wind noise" on this forum are the result of road noise caused by the doors coming part way open due to chassis flexing caused by this problem.