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AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 2012-2014 BMW 1 Series 135i (F2X Non LCI 3 Bolt) M Series 2007 BMW 1 Series 116D/118D/120D/130iThe 5100 Series shock absorbers for the 2012 2014 BMW 1 Series 135i (F2X Non LCI 3 Bolt) 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