These adapters have been designed to mount Wilwood 4 pistons rear calipers on the wheel hub of rally Subaru. Test Racing is constantly developing and perfecting their rally cars. These parts form a set of adapters that accommodate larger calipers for a better braking system. This design process requires several measurements of the existent components. Therefore, these adapters are designed using CAD software and then 3D printed to be tested on their vehicles. At their request, the parts were anodized and laser engraved. For more details, see Test Racing.

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