Integrated Engineering | Y-Pipe Adapter Kit (Audi RS3 8V / TTRS 8S)IE's Y Pipe Adapter Kit is used to adapt either your IE Downpipe to a stock catback or your IE Catback to a stock downpipe for the Audi RS3 8V and TTRS 8S platforms. If you are using either of our exhaust components with a stock counterpart, this Y Pipe Kit includes everything needed to make it an easy bolt on solution. Using specialized 3D scanners and software, IE engineers can design odd shapes and sizes to maximize flow and conform into tight