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Good question, but I dont think its gonna make a difference unless you are doing time attack in your GS. In that case you will need to have articles written about your car for being a luxury race car.
IMO the chasis braces are a mod that doesnt produce. I would save this kind of stuff for older cars with a tired chasis
I just installed springs,shocks,exhaust,front and rear sway bars. Like it so far. Me and a buddy installed them ourselves wasnt to hard to do. will get some pics up soon.