I just picked up a used one and was looking to upgrade the power on this baby. So far, all is stock. I was looking at http://www.performancechipsdirect.com/Audi/A6/ to start. What other upgrades would you suggest? It's just the 3.0, not the 3.0T. I think it's about 220 hp. I would love to get it to 250+ hp with not too much wear on everything else. I got a 500 dollar budget excluding work costs.