Audi RS4 4.2V8 B7 Downpipes and Hi-Flow Sports Cats
I highly recommend Milltek exhausts, an Audi technician told me that it's the nicest sounding exhaust for these cars.
The Milltek Sport downpipes and hi-flow sports catalysts are now available for the Audi RS4 V8 B7. They are available with either 100 or 200 CPSI (Cells Per Square Inch) Catalysts. These are designed to work in conjunction with the already released Milltek Sport cat-back system to produce a massive power gain and make the car far more responsive to drive - that's not even mentioning the improved sound track!

More information to follow soon...