Bilstein B4 DampTronic shocks and struts are direct OE replacements for the electronically adjustable dampers found on certain Porsche and Nissan models. Bilstein B4 gas pressure shocks and struts are specifically engineered to be the best choice for maintaining the original ride quality of your vehicle, while meeting or exceeding OE standards. These dampers are the ideal choice for the driver looking to restore the original performance and handling of their vehicle, with the added benefit of world-famous Bilstein quality.