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AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 2007-2011 BMW 3 Series 335i (E9X) CC 2006 BMW 3 Series 4The 5100 Series shock absorbers for the 2007 2011 BMW 3 Series 335i (E9X) 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 Series suspension