Quote: WHO RUNS STOCK supports on a race car? answer nobody, there you have it...
The ONLY stock part on a 9" you should be using in a hi-perf car is the bare housing, and that needs a backbrace. Get a good nodular iron or aluminum centersection and it will be just as strong, or stronger (and lighter), than a Dana...it just costs a lot more. This is if you're buying everything new of course.