Not trying to be the funny guy but the turbo inlet can’t be bigger than the hole in the turbo. It would be pointless.
From my research all these inlet pipes from Ecs, ram air, turbo technic etc are creating a smoother air flow in theory making engine more efficient and responsive. The Audi one is tapered and has a not so smooth bend in it which will create a restriction and turbulent air flow.
I doubt they will make much extra power but it should help efficiency and responsiveness.