The BMW front kit features progressive-rate double-bellow air springs placed over high-performance monotube struts. With 32 levels of damping adjustability upper mount camber plates and threaded lower mounts the struts allow for a wide range of customization. Integrated bearings in the upper end caps and spherical bearings in the upper mounts enhance the precision of rotation and friction torque. These elements work together to provide a comfortable ride and superior body support while allowing the vehicle to air out to 4.4” (112mm) from stock in the front making it impossible to go unnoticed. As the leader in air suspension products for over 70 years Air Lift Performance is committed to delivering high-quality parts that last. With a one-year unlimited mileage warranty excellent customer service and technical support you can purchase this kit with peace of mind.