Hi. I'm new to the list and am trying to find out which aftermarket modifications are worthwhile to my new (to me) 2003 S8. I've heard about the Milltek cat-back exhaoust (also the supersprint) as well as the GIAC software upgrade. Are these worth doing? How about a cold air intake? Some had expressed concerns about the K&N setup a while ago here.

I've surfed around and read back on this list and don't find much for this particular car. It seems great out of the box but could certainly use some more HP and definitely needed the p zero's I put on it. Thanks for your input.

Ron

 

Howdy,
I have a 2002 S-8 also interest in modifications. chips, and what ever is available.
I also want to try racing fuel but want to research what octane canbe used without damage to engine

back at ya