... 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 Ring | Intermediate Ring | Oil Ring We ... offer different versions of piston ring sets in original equipment quality as well as for older engines with the aim of reducing ...