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Bilstein B4 - OEM Shocks/Struts. It is recommended that you replace shocks in pairs (both front shocks, or both rear shocks). Bilstein B4 series shock absorbers are quality OEM parts and provide for superior handling. Using both monotube and twin-tube technology, Bilstein gives you the best in aftermarket parts. Constant damping characteristics under any load Consistent performance and handling give the vehicle a new car feel every time Proven Bilstein gas pressure technology High OEM quality standards Download the product PDF Download the application guide PDF Monotube Technology - the Number-One Choice in Motorsports The original and best mono-tube gas pressure shock absorbers all wear the Bilstein name, because Bilstein shock absorbers are the best there is. The number-one choice in motor-sports and for series-production sports cars, the monotube shock absorber has a unique design that affords the freedom to choose the ideal installation position or location. Monotube shocks feature a large surface on the working piston which increases the damping power and provides better handling. The design of the monotube shock improves the dissipation of heat which improves the life of the shock and enables a consistent and dependable level of absorber performance. Bilstein's Upside-Down Technology creates a safer functioning shock absorber. Twin-tube Technology - Quality Proven Under Rigorous Testing The twin-tube shock absorber is time tested and are used in most vehicles. Bilstein's twin-tube absorbers are "original equipment manufacturer" quality and have undergone extensive testing. These Bilstein twin-tube shocks offer a noticeable improvement over standard twin-tube shock absorbers. They can be installed quickly and easily. Twin-tube shocks employ oil or gas pressure technology. All twin-tube shock absorbers are OEM quality and rigorously tested. Twin-tube shocks are 2 Year / 200,000 mile warranty.