Hi everyone, after looking long and hard between an BMW 550 and Audi A6, look like the A6 will be the one I order. I have the options figured out and but wanted to see if anyone had installed a turbo or supercharger in a 4.2 litre A6? Is it a good idea? if not what options would you suggest to get the 400+ rwhp I am looking for? A6 because its going to be a family car so S$ is out. I tried a search but I only got A4 hits.

I wouldlike to hear your advise.

Thanks