The DBA 5000 Series two-piece drilled rotor for 2018-2020 BMW M240i xDrive M Performance (370mm front) pairs high-carbon cast-iron rings with aerospace-grade T6061-T6 aluminum hats fastened by NAS bolts and crimp nuts. The XD option adds non-directional cross-drilled and dimpled surfaces for improved cooling and sporty aesthetics while reducing unsprung weight and aiding heat management; recommended for high-performance street and track use.
DBA 18-20 BMW M240i xDrive M Perf (w/370mm Front Rotor) Front 5000 Series Drilled Rotor w/Silver Hat