Bilstein B6 4600 shock absorbers are designed as a direct fit upgrade to OE shock absorbers on your stock ride height Cummins. These shock absorbers feature a monotube design which provides consistent fade-free performance. B6 4600 shock absorbers utilize a unique, velocity-sensitive, digressive piston that reacts to changing road conditions. All B6 4600 shock absorbers are tuned for each specific application to ensure optimal performance is achieved. B6 4600 shock absorbers offer a significant improvement in ride quality, handling, and comfort.