Absolutely amazing, I didn’t expect it to sound this good, so with the first start I was blown away. I can actually hear the turbo, rather than a little whisper that you sometimes get with a 1.8TSi. Performance? If anything, the turbo feels a little more responsive and my car actually moves when it kicks in now, but the difference is minimal, adding more parts with a tune is the route to go. Really, though, I fell in love with CTS after purchasing this, will definitely buy more parts from them later on. As usual, UroTuning was a great help with assisting me with this purchase. Thanks, guys!