Picked up a '04 C5 A6 S-line over the weekend (the kid now has our B6 A4).
I’m trying to decide on the first mod, cat-back or APR tune, any recommendations?
Personally, I am leaning toward the cat-back.
Go for the free mod and gut the pre-cats. It can be a pain if you don’t have the space. Some people will trigger a CEL, but that can be remedied with an O2 eliminator adapter (spacer)
What engine? 2.7? Stick or auto?
Nice purchase! Now lets see some pics
Sorry, 2.7T with the tip.