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AST Suspension 5100 Series Coilovers (Includes Front Top Mounts Only) - 2002-2008 BMW Z4 3.0 Coupe/Convertible (E85/E86) F-250 2007 Subaru Outback BaseThe 5100 Series shock absorbers for the 2002 2008 BMW Z4 3. 0 Coupe Convertible (E85 E86) utilize inverted upside down technology. The inverted design is race proven technology and produces an extremely strong damper, providing better suspension geometry under heavy lateral and braking loads as seen in a road and track environment. The 5100 Series shock absorbers give your car a better performance than the standard twin tube design. With the 5100