The APR Roll-Control Coilover Suspension System is designed to dramatically improve handling while delivering a stylish visual upgrade to your vehicle's appearance. This is all made possible while retaining a comfortable and exciting daily driving experience expected from a high end system. With this system, you will experience a harmonious balance between the springs, struts/dampers, and bump stops thanks to a careful selection of spring, and damping only possible through the use of non-generic components. This system is built to last. Unlike bargain systems, we only use premium materials. The struts are made from stainless steel, with anodized aluminum spring seats, allowing years of height adjustment without worry of rust destroying the threads. The springs are made from a high tensile strength chrome silicon which greatly resists sagging. Spring seats feature a locking collar, instead of a set screw, which prevents a common failure. Thick stainless steel stabilizer bar end link mounting tabs are strong and allow adjustment for proper orientation. There's no worry of end link binding issues, and they will not bend like thin aluminum systems found on even some of the higher end systems. Lastly, each shock and damper is dyno tested for quality assurance. This system delivers the premium quality components and the driving experience you have come to expect from APR. Every shock is dyno tested Adjustments: height, corner weight, and stabilizer bar end link position Excellent corrosion resistant materials throughout Anodized aluminum spring seats for superior corrosion resistance Application specific bump stops Designed for street and track use Lower up to 55mm all around, depending on factory ride height Upright stop collar with integrated keyway Serviceable front struts Stainless steel monotube strut design Rear dust boots included Easy height adjustment: 50mm front and 25mm rear TIG welded components High tensile strength chrome silicon springs Noise reducing spring isolators Included height adjustment tools prevent thread stripping Made in the USA Improved handling, precise turn-in response, and enhanced grip Locking collar front spring seats VEHICLE FITMENT 2015-2020 Audi A3 Quattro Premium Premium Plus Prestige (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L) 2017-2020 Audi RS3 Base (Liter: 2.5 & Engine(ci): 151 & Cylinder: 5 & Block: L) 2015-2023 Audi TTS Quattro Base (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L) 2018-2022 Audi TT RS Quattro Base Heritage Edition (Liter: 2.5 & Engine(ci): 151 & Cylinder: 5 & Block: L) 2015-2023 Audi S3 Premium Plus Prestige Premium (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L) 2015-2023 Audi TT Quattro Base (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L) 2015-2023 Volkswagen Golf R Base 20th Anniversary Edition (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L) 2019-2021 Volkswagen Arteon SEL R-Line SE SEL Premium R-Line SEL (Liter: 2.0 & Engine(ci): 121 & Cylinder: 4 & Block: L)