I've had this exhaust on now for two months, and let me say, it is an absolute world of difference!
When the valve is closed, the system is a little quiter than OEM, for those who want a nice improvement on tone and performance, without it being extremely loud. When the valve is open though, it sounds like you have a muffler delete!
I drive with the valve open 100% of the time. I don't have a tune yet, and I have noticed a significant increase in gurgles, and pops, even when downshifting! There's a sweet spot between 3k-4k rpms 😉, but it still sounds amazing across the whole rev range.
Install is very straightforward, took me and a buddy a few hours and we took our time.
This is probably the best exhaust system you can get for your EGT Sport/N-Line!