Eibach ERS 60mm ID Linear Tender Spring - 2.87" Length (40-60-0070) YMM_2003_2010_Bmw_5_Series_V_E60_E61 this filter helps support optimal

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The high-flow air filter utilizes advanced filtration media to ensure optimal airflow and dirt exclusion

Eibach ERS 60mm ID Linear Tender Spring - 2.87" Length (40-60-0070) YMM_2003_2010_Bmw_5_Series_V_E60_E61 this filter helps support optimalLinear Tender Spring by Eibach The ERS systems relies on a Main and Tender spring concept that provides a softer initial rate when both springs are compressed together, then delivers the desired firmer ending rate once the tender spring closes completely. The Main spring has a linear rate characteristic and determines the final rate of the system. The Tender springs are available in a variety of linear rate as well as progressive rate characteristics