Just to throw it in the mix, my 2 way Carbonetics doesn't have noise, knocking, wheel hop; I didn't experience any off throttle corner entry understeer, when she does step out of line she is very controllable.
I have an Aristo diff in her now temporarily but noticeably in the wet , she would happily sit at the traffic lights spinning the inside wheel no matter how soft you take off, few times on the Motorway in the wet or dry the back will step out with some throttle, can easily catch you out and nearly did when I was overtaking a bus on the motorway in the wet, nice drift between the armco and the bus, it was a brown pants moment.
The 2 way carbonetics did not have this issue, just point and shoot , she gripped, if you wanted you could get her to step out, under heavy braking going down the box she will wiggle around abit, you just keep her inline with the feel through your arse and some steering inputs but I like the 2 way diff, you get the to be in full control.
Reminds me of a 911, with the torsen diff she sits and waits plotting to kill me They are dangerous, unpredictable compared to 1.5 or 2 way , its bloody annoying coming out of a corner, wasting all that power spinning one wheel, all noise no action
Only problem with the Carbonetics is the the 3000KM oil interval changes, based on this I would go TRD or OsGiken.