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Eibach ESS Speedway Conventional Single Rear Coil Spring - 150 lbs/in Rate, 3.05 in. Block Height bc-racing-damping-extenders 2009 Audi A3 FWD (w/Eibach's ERS line has evolved over the years to be the world's most prominent, comprehensive and superior Race Spring System. Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Thus, Eibach constantly achieves the most linear spring characteristic (rate) while maintaining the lowest tolerances and the highest quality in the industry. Eibach's ERS line has evolved over the years to be