Bilstein B4 Air Suspension Replacements are replacement suspension modules for vehicles where the air spring and damper are mounted together as a strut. As with their separate B3 Air Spring range, the air-bags need to perform exactly the same as the originals in order for your vehicle to ride and handle correctly. Because the shock absorber is attached to the air spring unit, this also needs to be valved the same as the original units to work correctly with the air spring. Bilstein have integrated one of their industry benchmark B4 shock absorbers into the strut.Replacement unit for vehicles with all in one damper and air springPrecisely matches OE units for factory spec ride qualityPlug and play compatibility with original electronicsFor vehicles where the air spring is mounted onto the shock absorber in a strut arrangement, Bilstein offer B4 air spring strut modules.These feature an air spring designed to work correctly with the vehicles factory fit air suspension system. Modern air