[Aubrey N Bruneau]

As I understand it, the purpose of a rear "anti-roll" bar, is to help resist the tendency for the entire car to twist or "tilt" to the right on launch, and in the lower gears ? Right ?
In extreme cases ( and I think we've all seen those videos of the early 60's Chevy nostalgia match racing cars that almost lay on their right side on launch ), this CAN'T ber safe.
Solution ?
More weight jacking to the RR spring ? ( "side effect".. no pun intended... car goes back to tilted left at high speed )
WAY stiffer springs ? ( to what end ? ... till the rear suspension doesn't move ? )
Or... install a simple device that manufacturers have used to control body roll, since the late 1930's ?
Cars with rear coil springs, will inherently be less resistant to the body rolling to one side... mostly due the fact that the springs are usually located much more inboard than a leaf spring car.
Having seen some of these "twisted" launches... I think cars with the problem should be required to control it.

As with anything. there's trade-offs.
A rear ant-roll bar, without a front anti-roll bar ( most of us don't use a front one ), creates a car with dramatic over-steer characteristics. Add to that, our low pressure rear tires, and you have someing that you better not try and make sudden moves of the steering wheel at high speed !

To me, if it's not changing the suspension geometry in any way, and you're not welding in a bunch of crap... a rear anti-roll bar should be permitted, and specified as such.
and no... I don't have one.