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These Brian Crower titanium exhaust retainers are specified for Toyota and BMW B58 engine applications and are described as titanium retainers for the exhaust valves. They are intended to secure valve locks on the exhaust side and provide the lightweight, high-strength retention features associated with titanium components when rebuilding or upgrading a B58 valvetrain.
Brian Crower Toyota/BMW B58 Titanium Exhaust Retainers
