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Riaction TPU Coilovers for 2002-2008 Audi S4 (B6/B7) air-lift-performance-rear-slam-kit vehicle-specific fit for the AudiThe Riaction TPU Coilovers for the 2002 2008 Audi S4 B6 B7 bring Riaction's digressive damper technology to the Audi S4, engineered for drivers who prioritize high speed control, flatter cornering, and sharper response than a linear coilover can deliver. Each TPU set is built to order so valving and spring selection are matched to your exact Audi S4 application, with the same 32 level damping adjustment and full length ride height range you'd expect