This exhaust is exactly what I was hoping it would be. Hard to describe, but its the perfect amount of rumble, with no drone or annoying sounds. Cold start is a little noisy, but not necessarily enough to wake the neighbors.
Installation was relatively strait forward. Directions in the box were very clear and informative.
I had some concern about condensation leaking from the slip joints, but i contacted AWE's support and they were incredibly knowledgeable and said it was normal until it heat cycles a few times.
The other concern was a...Whistling sound? Squeak sound? I'm not sure how to describe it, but under load (i.e.: full throttle and boost) I would hear an indistinct hissing or whistle sound in higher RPM's. We have narrowed it down to my turbo just...doing its thing. Apparently the exhaust freeing up some flow allows it to make noise. Ever since that discovery was made, I can tell its my exhaust impeller spinning up and its quite a pleasing sound.
Long rant short, definitely suggest this for the STI if you daily it. Beautiful craftsmanship and a "sophisticated" sound.