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i dont see much a difference. the square tubing "theoretically" would work better twisting bu, . any twisting over that long of a span, would happen either way. then, that much a a twist in that brace would be the least of your concerns. thous little bolts are the same diameter and looks to be height while comprised. slots look the same. so if you think they are an issue, porsche sure did not. looks like the would match up fine with the stock unit. compression and extension are likewise not much of an issue, being when tightened, its one solid rod.
i wasnt talking about rotational twisting of the brace, but twisting of the frame so one side is lowering and the other is raising... that would be a moment at the bolt area.
one thing to note, is that if there is bending of the stock bar, wouldnt it becaused by just jacking the car up? thats much more force than can be applied by the car pulling lateral gs, right?
for that purpose alone, its a valued investment, plus it looks great.
The tabs in the fenders aren't necessarily square. Depending if you want the brace and tabs to be perpendicular to the centerline of the car, you may need that adjustment. If you look at the factory bar, they are also slotted for that reason.
I finally got around to having a batch of these made. All the structural components are anodized black 6061, and the hardware is stainless. The standard brace is 620mm long, and allows for minor adjustments. If severe preload/adjustment is required for any reason, a narrower 610mm link can be provided.