Performance Friction Direct Drive system for Competition-use Porsche 997.2 GT3 features a Slotted version designed for race-applications only. Price is per rotor. 2-piece rotors offer better cooling over a one-piece design. Performance Friction’s full floating Direct Drive attachment system allows the brake disc to naturally expand/contract both radially and axially without being constrained by the hub. This helps eliminate rotor warping, vibrations and pulsations. Due to the high quality of Performance Friction’s design and manufacturing, the Direct Drive rotors are completely silent and rattle-free – a trait typically found in many competitor’s 2-piece designs. The hat assembly is completely reusable – no need to buy the entire rotor again! And, because the rotor is designed for use with the factory caliper, you can still use your favorite Performance Friction brake pads!