From the way it was described to me, the OEM LSD is a 30% power transfer. The Giken is 100%. So if one wheel goes off ground, the OEM will Xfer 30% power to the wheel on the ground, while the Giken will do 100%(this is probably oversimplifying it a bit, but that's the best I understand it.)
The fastest 370's at the track days I go to all use the Giken. I can not see me doing it anytime soon, as my skill level is still low and this upgrade probably wouldn't do me much good yet. But the guys that run the fastest 350's/370s I see are using the Giken.
Can't comment on the Quaife but they make good stuff.
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Current Mods: Vorpal Weapon +5.
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