I am doing some consulting work for a gentleman who turns out is an Audi guy... we chat it up a bit and he was saying that he would be interested in some headers, exhasut work, cats, etc to open up the breathing on his S6. While I don't know too much about tuning that engine (I'll stick to my little turbo for now) I thought I would ask you guys....

I have read around, and brian 4.2's supersprint looks great, although I didn't see a full review of it. The S6 mod scene looks kinda sparce, likely due to small market. How many A6 4.2 or A8 parts are interchangeable? (Not that there are that many parts for those cars either ;-) )

anyone know of a custom shop that would make headers?

TIA

Certainly has options on cat-back exhaust. Beyond that, upgrades will get pricey.

in the high end of the RPM range.