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These braces reinforce the front sway bar mounting points on the front subframe. The sway bar mounting points are known to bend and/or break under cornering loads from aftermarket sway bars on cars that are running stock spring rates, because the sway bar is doing all of the work to prevent body roll. This makes these braces important for any car competing in Stock class autocross. Cars with stiffer spring rates are less likely to see failures of the sway bar mounting points on the subframe, but these reinforcements can still be added for peace of mind.
Installation Instructions can be found here: