KU31 are not quiet at all, both me and my mate had them and changed from it, they are very noisy, especially when it's near the indicator...
Adrenalin RE002 235/40/18
Dry: 8/10
Wet: 8/10
Price: $350ea fitted & balanced @ Tyre Power
As above, had KU31 before and these re002 were HEAPS more quiet. I had them stretch to 10" rims and can tell the sidewalls are noticably more stiff compared to the KU31, had heaps of grip accelerating and braking. Haven't had the chance to try this on the wet yet but keen!
Can't wait to try the Z1 star spec next after i finish this set