I've been posting on the VWvortex forum for some time and, as I am already aware, parts are not common like a honda or mitsubishi.
What I do not like is how the 'chip exchange' regulates everything. If you want a certain amount of performance, you buy chip 'x.' What really sucks is that you need to end your ecu away to have them transplant the chip. Also, the computer on these things control alot more than on japanese cars and limit what you can to a greater extent.
The known solution to this is the stand alone, and there are a few companies out there manufacturing them, but I can't find out who makes them.
Any Audi/VW insiders here?