Project Mu FS44S Forged 4 Piston Slim Front Brake Kit (355mm 2 Piece Rotors) 2013+ FRS BRZ 86 2022+ BRZ GR86 cooling high impact lens material to resist honda high impact lens material to resist chips and cracks from road debris It has a great initial response and a wide operating temperature range making it far more resistant to fade than OEM brake pads Caliper Feature Spec FS4M Street 4POT (Kit FS4M F103SP) FS44S Sports 4POT (Kit FS44S F103) FS44S Sports 4POT (Kit FS44S F103B) FS44 Standard 4POT (Kit FS44 F103A) Axle Position Front Axle Specific Front Axle Specific Front Axle Specific Front Axle Specific Caliper Profile Design Slim Street Body (17" Wheel Friendly) Slim Body (High Wheel Clearance) Slim Body (High Wheel Clearance) Standard Full Size Forged Body Piston Pad Architecture 4 Pistons x 2 Pads (Standard) 4 Pistons x 4 Pads (1 Pad Piston) 4 Pistons x 4 Pads (1 Pad Piston) 4 Pistons x 4 Pads (1 Pad Piston) Rotor Spec Design 315mm x 30mm (1 Piece Round 6 Slit) 332mm x 28mm (2 Piece Straight 8 Slit) 355mm x 28mm (2 Piece Straight 8 Slit) 345mm x 32mm (2 Piece Straight 8 Slit) Target Application Entry Street Upgrade OEM 17" Wheels High Clearance Street & Track (17" 18") High Clearance Street & Track (18"+ Wheels) Heavy Duty Trackday & Circuit Use each piston acts independently on its own dedicated pad