chucklane

First off i dont have an audi nota porsche. Cargraphic makes exhausts for audi as well and i have order a set for my 2002 S8 and had a few questions. Nobody over at the audi forums has this so here it goes?

How is the reliabilty?
How about the warrenty?
Is there a better exhaust note as well as increase in HP (I know this Q will not directly relate to the S8)

Thanks

Charles