After less than 2 months of ownership of the car, I decided to go stage 1.
When I first got the S4, I thought I didn't need any more power from the car.
Adam at GMP let me ride in his stage 1 B8.5 S4 and that was all the convincing I needed.
The car is so much more responsive and fun to drive!
Also installed a USP intake at the same time with the tune and I'm pretty sure I've been under 15 MPG these past couple days.

If you are local to the Charlotte area, definitely check out GMP. Adam was very accommodating to my schedule and helpful throughout the whole process.
I saw 3 B8 S4s the last time I went to GMP. Any of you guys?

If you are on the fence about going stage 1/2, just do it! Won't regret it