Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
High-quality stainless steel 1.4301 (SS304)
Diameter 70mm with adapter for the original exhaust system
2 Racing Catalyst Converter (100 Cells / inch)
Better performance by reducing back pressure, significantly higher torque
Plug and play for Audi TTRS 8J and Audi RS3 8P
Compatible with the original downpipe
May not be approved for road use in your region.