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The DBA 4000 Series plain front rotor for 1987–1991 BMW 325i is a direct-replacement rotor cast from XG-150 high-carbon alloyed iron and heat-treated with Thermal Stability Profiling to withstand repeated hard braking. It incorporates DBA's Kangaroo Paw ventilation with 144 diamond and teardrop pillars to raise surface area and improve cooling efficiency over straight-vane designs, while the HD plain finish preserves a smooth OE-style appearance.
DBA 87-91 BMW 325i Front 4000 Series Plain Rotor
