Turbo Groove automotive brake discs have a widened, arcuate gap that increases the flow of cool air, lowering the temperature of the brake pads and brake disc, while draining dust, dirt and hot gases better than a straight line, which can rust and become ineffective. Drilled holes remove surface gases when braking from high speed, while not weakening the structure of the disc as in through drilling. TECHNICAL DATA Type: Drilled and Slotted Full / Ventilated: Ventilated Number of holes: 5 Diameter (mm): 321 Height (mm): 52 Thickness (mm): 30 Minimum thickness (mm): 28 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year AUDI A6 QUATTRO AVANT C5 / 4B 2.7 TWIN TURBO 97-99 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 97-99 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 97-99 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO AVANT C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO AVANT C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO C5 / 4B 2.7 TWIN TURBO 99-2004 AUDI A6 QUATTRO C5 / 4B 4.2 300 99-2004 AUDI A6 QUATTRO AVANT C5 / 4B 4.2 300 99-2004 AUDI S6 C5 4.2 340 99-2003