Piston Ring Sets: for Audi engines. AUDI: 100, 200, Quatro, 80, 90, A3, A4, A5, A6, A7, A8, TT, S4, ... S5, R8, Q5, Q7, etc United Material Piston Rings: for Audi Engines Compression ... for this purpose. Application:Piston rings set for Audi automobiles engine.Car Models: 100, 100 Quatro, ... Quatro, V8 Quatro, A3, A4, A4 Quatro, A5, A6, A6 Quatro, A7, A8, A8 Quatro, TT, TT Quatro, ...