The stock pieces are designed to work for a stock car under normal type conditions. Under heavy braking, the front control arm main pivot flexes, causing changes to your alignment. After upgrades like stickier tires, brakes or stiffer suspension bushings, the OEM brace doesn't cut it when pushing your car to the limits. The Perrin Front Control Arm Braces for your Scion FR-S / Subaru BRZ are CNC machined from 6061 Aluminum making these parts much stiffer than the stock part.
The stock stamped braces are made from steel and painted black. This is a very inexpensive way to make a part like this but it comes at the expense of weight. A set of these are lighter than the factory part by 3.5 pounds while still being much stiffer!
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