StopTech E90/E92 M3 Trophy Sport Big Brake Kit-Rear
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Based on the StopTech ST-60, ST-40, and ST-22 calipers, STR calipers feature the same metallurgy and design, but are engineered to provide a 20-percent reduction in weight without sacrificing stiffness or performance.
STR calipers are also available in Sport Trophy kits designed for production street driven vehicles which utilize dust boots, anti-rattle rotor mounting hardware and include StopTech Street Performance brake pads in most applications.