Audi S2 / RS2 5 Cylinder Manifold Flange, laser cut from 10mm 304 Stainless Steel. We use these on all our race car and rally car builds. We can also supply pressed steel transitions in either 304 or 321. The 321 although more expensive offers the ultimate in terms of strength and longevity. Please note, the picture shows the flange without transitions, if you want these choose either 304 or 321 from the options list below. For turbo applications the 321 is highly recommended.