Everyone has been explaining to you the best way possible and saying as nicely as they can not to **** your friends car with a $200 exhaust system yet you are so bent on getting this done you don't see it.

Seriously I mean you might know about cars no one is doubting that but just listen to these people they know more about Audi's then you since they have probably been here longer and own Audi's. You aren't going to make your friend happy with a 200 exhaust system instead take him out to a strip club and buy him a few lap dances.

Seriously don't ******* ruin his car.