Audi S5 V8 quattro under development
I highly recommend Milltek exhausts, an Audi technician told me that it's the nicest sounding exhaust for these cars.
As part of an ongoing commitment to bringing the highest quality products to market before anyone else, Milltek Sport have already acquired an Audi S5 4.2 quattro for transformation.

The car is in the hands of our exhaust development engineers at present whose task will be to develop a performance exhaust system that strikes the perfect balance between incredible sound (without being noisy), performance increase, and subtle but sexy looks. Until all of these requirements have been met, the product stays in development!

We will post more information as and when it becomes available on this page...