I want to see if I can get my 2006 S4 running like my 2004 S4. My 2004 is real responsive and peppy. I recently changed spark plugs, oil, fuel filter on both cars. I was wondering what settings should I compare to see why the 2006 might be less responsive. It runs good and smooth but noticably less pep. I want to look at settings on both to see if there is anything outstanding that could be making the difference.