Anziil

So I have decided I've had this car for a bit it's time to free up some air flow with an exhaust system. Any recommendations on what brand and type I should go with on a 2001 Audi A6 2.7L Quattro. Automatic transmission. I want it to sound nice. I also want to know if anyone else has after market exhausts how has it been? I was thinking bigger pipes but then realized that's NOT always good. Especially with the turbos. So a Nice cat. And a muffler. And any other pieces that should be changed? Thanks in advance.