Important Note for K03 Turbo owners looking to perform the S3 upgrade:
The OEM Turbo discharge transfer pipe part number 1K0 145 840 Q - does Not work with the Audi S3 Intercooler upgrade as the Intercooler entry side turbo hose has a different orientation of locking keyway.
This 'non working' transfer pipe is 'generally' fitted to (and therfore effects) later cars, typically MY 2006 onwards. However an actual inspection of the pipework type fitted to your car is always recomended as it is not easy to state what models have the 'Transfer Pipe that works' fitted by chassis look up.
See the images below for infomation on what you are looking to identify for whether you have the correct pipe already fitted to your engine.