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Here, in all its machined billet, electroless nickel-plated glory is the mother of all front brake calipers. Engineered specifically for short-track and road-course competition--by far the most brake-intensive events in NASCAR's Sprint Cup series--the Raybestos PC1108 caliper as used by Roush Fenway Racing is no less than 9.24 inches wide, and is loaded with a six-pack of titanium pistons. We're told each caliper is worth well in excess of $4,000. It's a straightforward task to fit this 6.3-pound work of industrial art under the front fender of a Sprint Cup Fusion, but was a more demanding mission for the crew at Roush Performance to mount it within the confines of a '13 Mustang's busy front end.