The differences between the stock rotor and caliper (left) and the AP Racing pieces (right) are quite apparent. The stock rotor is a 12.5-inch vented disc, while the AP Racing rotor is a 14.25-inch vented and slotted disc. The stock calipers feature two pistons, while the AP Racing calipers showcase six. In addition, the AP Racing caliper is a fixed-mount piece, while the stock caliper is a full-floating unit. In any case, the new parts and pieces are much beefier than the stock ones, requiring us to be careful in our choice and size of wheels.