is there any performance mods for the C4 2.8 V6 wagons?

[Scott Phillips]

For more in "tuning" those car you can check out: 

http://www.awe-tuning.com/

They offer ECU and Trans Chips
As well as the mentioned Supercharger..

I put the trans chip in my '02 Passat 4 Motion, (30V V6), 
And it made all the difference in the world.

But if you're going to dump that kind of $$ into it
Why not look for a S4 / S6??

-Scott