This 6-piston big brake kit makes your BMW a super-stopper, with 338mm ECS 2 piece rotors, and six-piston calipers loaded with new pads. Requires 17-inch or larger wheels. Kit includes everything needed for install: BMW Performance 6-piston calipers ECS Tuning 2-Piece 338x26mm rotors ECS Tuning Exact-Fit Stainless Steel Brake Lines Hawk HPS pads Pad wear sensor ECS stainless steel rotor set screws Minor modification of dust shields may be required. Dust shields not requiring modification can be purchased separately as 34106780216 and 34116780215.