Not Ranked
I had the same problem with mine, definitely sounded like the rollbar but turned out to be the lower rear control arm bushes.
Try spraying a good penetrating lube on the bushings and see if the noise gets reduced or eliminated. I spoke with dynamic , the builder of the car and the parts /tech guy ( name escapes me, nice helpful guy) said there's a grease fitting kit available to fix the problem. I was going to do it but sold the car before getting around to it.
Personally I'd rather see someone come out with a non-poly bushing. A bit more compliance and less stiction / bind would make the car work better in transition and ride better, not to mention reducing or eliminating the problem you're having.
Kevin
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