2007-2011 Porsche 911 (997) GT3 / RS Carbon Ceramic Brake Rotors GT-R this kit reuses the M5's

this kit reuses the M5's factory front and rear calipers

so it only applies when your front calipers are 4-piston or larger

which is why using the supplied pads matters

Spoke shape and inner-barrel clearance also matter around the 10-piston Akebono caliper

You reuse your factory calipers and just swap the discs

2007-2011 Porsche 911 (997) GT3 / RS Carbon Ceramic Brake Rotors GT-R this kit reuses the M5'sReal Customer Builds & Reviews View All Will This Fit My Car? Direct Replacement CCB Discs (Retain Factory Calipers) for the 2007 2011 Porsche 911 (997) GT3 RS. Factory rotor specifications and the smallest wheel that clears each trim: Trim Front Rotor (Factory) Rear Rotor (Factory) Min. Wheel Size GT3 RS 350mm or 380mm, 380mm (PCCB) 350mm, 350mm (PCCB) 19" Keep Your Factory Calipers? Keep them if the front calipers are fixed 4 piston or more the rear