The GM H/D rotors are the way to go.All the T1 and factory test mules use them and at $81 a piece you cannot go wrong-Drilled-Slotted rotors on a C5 are for looks only. Be sure to change out the rubber lines and go to braided lines,GM rubber lines soak up moisture and cause bubbles. Use only Ford H/D brake fluid or Weldwood Brand Fluid. Many good pads to pick from--you will find the GM H/D and Hawk pads to work out just fine