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Function and Form Type 4 Coilovers for 2011-2017 BMW 6 Series (F13) Audi Riaction coilovers for the 2004-2008The Function and Form Type 4 Coilovers for the 2011 2017 BMW 6 Series (F13) are the brand's premium coilover system, built around an inverted monotube damper for OE plus refinement and high end ride control. Engineered to give your BMW 6 Series a planted, composed feel, these 6 Series coilovers combine a clean lowered stance with the smooth, controlled damping that makes the 6 Series F13 feel composed on any road. Also branded Function & Form F2