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Originally Posted by Bobiam
I have doubts that the 2 extra bars mean much. If you look at the rear of that alum plate where it is bolted in, that's a fairly light duty drop section of framing. It can't possibly be designed to do much in the way of providing controls of stresses regardless of what framing you attach to it. That triangular shape of the plate is likely to prevent a twisting motion but I doubt it has much work to do. I'll call 'em "Can't Hurt Bars"!!! Just one guy's opinion.
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Yeah, the lower side bars certainly can't hurt. They're something simple to install (easier to install than the main bar) that can further reinforce the stress plate.
As for the drop section of framing in the very back, it was loose and almost falling off on my car when I bought it used. I assume the mounting bolts just vibrated loose. When I tightened it up (this is before I installed stress bars) I immediately noticed a difference in cornering in the car. So I do think it does something in tying the back of the stress plate down solid, and like you said, probably preventing some twist. I think that adding the side bars and triangulating the whole thing certainly would help with this function.