I have recently purchased the stage III kit from APR for my 2008 S3. I have a question as to what catback modification is necessary to compliment the kit. As of now I cannot purchase an upgraded catback (ex. miltek) because in order to do so I would need to import it and the emission's law in my country won't allow it. Even if they could be persuaded the tax on the catback would be devastating. The laws on car modifications here are crazy. I could be fined for driving 19 inch rims instead of 18; things are so strict. That leaves me with two options; fabricating the catback here or sticking with stock. As to the first option I am not sure as to the reliabilty of having it built to fit my car. The question is whether I can stick with the stock catback and fabricate the downpipe? What would be the implications of this? Would the car run the same? Overheat? Would I be causing any damage and if not would I be utilizing the the full power of the kit? Do I need an upgraded catback?