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Rough on the outside, all the precision is on the inside of the carbon-fiber driveshaft. Tier 2 supplier Toray lays up the shaft with a precise inside diameter--the non-critical outside diameter is low tolerance--so that Tier 1 supplier Neapco can precisely press-fit the shaft's steel ends. The carbon shaft is built from 12 carbon-plies laid in combination of longitudinal and angled biases. A second, thicker layer of fabric at each end of the shaft helps during crashes. The outer layer expands and shatters the shaft under high axial loads, greatly reducing the threat from the driveshaft as the car compacts in a major crash.