Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
Downpipe Kit without precatalyst converter and optional with 2x 100CPSI Racing catalyst for Audi TTRS 8S and RS3 8V Facelift
made out of high quality stainless steel cast 1.4301 (SS304)
without precatalyst for maximum performnace
complete 2x Ø70mm
CAD-designed and flow optimizied
2 lambda probe connections
100% perfect fit, plug and play
less thermal load on the turbocharger
more power by reducing back pressure
significantly higher torque
suitable for Audi TTRS 8S and for Audi RS3 8V facelift models
compatible to stock after-catalyst-pipes