I took the s40 to eastern creek on the weekend and after everyone else had left did some back to back laps against someone talented In a gt86
The s40 was noticibly faster through the corners and I could get on the power at exits way sooner than she could
Stability was also godlike better... if you feel the front starting to slip much, pull back 5% and it instantly grabs. It's insanely easy to keep on the ideal line at any time in any corner
I'm still running the stock tune because I'm still learning the car even after this long. On the straits it could be faster... but the power is fine for everywhere else
The rs3 hankooks are proving excellent
Only thing it really needs is dump pipe and maybe exhaust to speed up spool