 I bought mine at a huge discount 
because it was a dealer buy-
back.  Apparently, some earlier 
S4's had engine & tranny 
problems, so mine got a new engine and 
a new transmission with "bug" fixes, 
and now the car runs perfectly.  The 
previous owner should have kept it, 
because I am now enjoying a flawless 
vehicle!
We all know about the super 
performance and the bad gas mileage, 
so let's get past that and talk about 
what a great stealth vehicle this car 
is. I also own a heavily modified 
Mitsu Eclipse GSX that is a "Fast and 
Furious" type vehicle, but my S4 
outperforms it, and has quiet "class" 
as well.  With the premium package, 
this car is tops!  M3? Humbug!