and get me pics so I can decide I don't want to do it.

<img src="http://www.eastwoodco.com/images/us//local/products/detail/p16482.jpg" />

I really would like to see what the C6 would look like with some larger flares.

on the C5 A6 4.2 the fenders were flared out more so than on other C5.

That tool is for rolling the fender *lips*, to help keep wider tires from rubbing. After rolling the fender lips, the results should NOT be visible from outside the car. If the C6 A6 is like the B6 A4, the fender lips are basically rolled from the factory (completely folded back).

Using that tool to try to visibly flare out the fenders more would totally mess up the paint, etc. Not recommended!

HTH,

Brian