Your not going to be able to do all that much. There is no aftermarket really for the Touareg since there is no demand for much offroad stuff. You can put oversized tires on them, but you are limited to 32" on non TDI and about 30.5" on TDI's. There are a few people doing lift kits, but there is nothing being done commercially for sale. Anything you do will be DIY.