I made one for my car, and I can certainly tell it's there. I also have GC coilovers with 350lb/inch Eibach springs, but the effect was noticable even when I had the old saggy ST springs.
It just seems to firm up the front better. Since I run SCCA CSP, I am only allowed to cross connect the towers, but not tie into the firewall. I wish I were allowed to brace the towers fore/aft....
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