HKS EIDS (Electronic Idling Stabilizer) 99-02 Nissan Silvia S15 Turbo - P/N: 4605-RN001 Product Model: HKS-4605-RN001 Type H-1 The HKS EIDS has been developed to buffer dramatic airflow meter signal fluctuations. By buffering these fluctuations the EIDS prevents engine stalling or stumbling associated with sudden imbalances in air/fuel ratio of airflow meter-equipped vehicles that utilize atmosphere venting blow-off valves.