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Its diaphragm springs are heat-treated through a rigorous four-stage process
which helps maintain a clean and secure fit over time
High torque sprung hub and disc assembly
AST Lowering Springs for the 2004-2011 BMW 6 Series (E63/E64) are manufactured from a premium high tensile chromium-silicone wire which is handpicked by AST engineers for its quality and metal consistency
Bilstein B12 (Pro-Kit) Suspension Kit for 2016-2021 Audi TT Quattro Exclusive - 2009-2016 Mercedes-Benz E550 Its diaphragm springs are heat-treatedBilstein B12 (Pro Kit) Suspension Kit for the 2016 2021 Audi TT Quattro include a complete set of Bilstein Performance Dampers paired with Eibach (Pro Kit) springs that provide moderate lowering between 24 40mm (depending on application). These kits offer Dampers and springs that are tuned for each specific application to provide the best fixed height lowering solution. Bilstein B12 (Pro Kit) Suspension Kit provide the perfect combination of