2. The new Wilwood D52 (PN 120-10936-RD, $165 each) calipers are made from net-forged aluminum. This makes them lighter and stiffer than stock cast iron calipers and helps give the driver a firmer pedal feel. Also adding to improved pedal feel is the fact that they are machined with much tighter tolerances than stock. The two-piston design allows for a more even clamping load on the brake pad. This helps eliminate pad taper, which can happen during aggressive driving.