Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
Downpipe for Audi TTRS 8J / RS3 8P without catalyst converter
Diameter of 90mm to 2x 70mm
High-quality stainless steel 1.4301 (SS304)
CAD-Designed and optimised
1 Oxygen Sensor Connection
100% oem fit, easy to replace factory part
No Precat so less thermal load for the turbocharger
Better performance by reducing back pressure
Significantly higher torque
Suitable for Audi TTRS 8J and 8P Audi RS3
May not be approved for road use in your region.