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Cusco rear member collar bushing for GRB STi is a replacement mount collar intended to reduce chassis and drivetrain flex at the rear member. Designed for Subaru GRB STi applications, the part restores firmer mounting characteristics to help maintain alignment under load. It’s used to tighten rear-end response and improve vehicle stability during spirited driving or performance-oriented use.
Cusco Bushing Rear Member Collar GRB STi
