Stephen,

Yes, I raced against you and your brother at the Pocono dbl. I was in the Blue #25 Rabbit GTI. I was actually paddocked right next to the grid fence, on the other side of the lane that went to the grid than you guys were on.

Do the Audi's have a rear beam axle like the VW's? If it's a similar design, you might be able to use a BSI style rear bar.

Or, you may want to take Kirk's advice. You might be able to use a dirt track style torsion bar (can get them in different rates) and then just attach the mounts to the axle beam.

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MARRS #25 ITB Rabbit GTI