Hi my name is Arjan and I am from the Netherlands. I drive an Audi A4 b6 1.8T 163 HP. I found this forum because I was looking for information to replace my cat. My is dying and I have bought another one from milltek. So that is why I am here The intensions are to replace the complete exhaust system for a milltek exhaust system, replace the oem airbox by a carboni airbox, remap and a diverter valve. And also I would like to replace my stock rims for the new model RS4 rims.