I've had my s2000 most of the winter. No issues. (Is within a heat shield mind)
Slightly better in performance, it is louder. But at £15 I wouldn't hesitate doing it again.
.Everyone who has logged them has seen a 3/4g/s improvement.
My felt slightly more powerful top end.
I don't really know, all I do know is that the most powerful K03s, potentially the most powerful K04 and the most powerful K04 hybrid runs one. And we all used to run Jetex filters.
Which is enough for me