No sense arguing the point.

I haven't heard an explanation for why the rule change was made. Ford 9" and QC give faster tuning, but at a large cost. I don't know if QC retains axles like a Ford 9" does, but as I said, if that is the explanation for change, a person can add c clip eliminators to your garden variety chevy 10 bolt. Like Cameron said, if costs get out of control for a beginner class, it only makes sense to spend the same money on a modified (X or A).