I can speak to the Nismo GT Pro LSD. I considered the 2 you have listed as well but, ended up going with the Nismo set up mainly due to overall cost and what comes with this kit that you have to spend extra for. I can tell you first hand as I did the install myself last weekend that it is a drop in fit. Everything was in spec and utilizing the included instructions and FSM I had no issues at all.
As for drivability I can only say that with figure 8's done and 100 miles or so of highway driving it is very quite. I have it set at 80% and with VDC on turning slow tight corners activates it a little.
I will be tracking it this Sat and Sunday on new BFG R1 285/18 square which should be a good set up.
I can give some further feedback on this LSD after this weekend if you want to hear more.
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Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY
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