LSD throwdown: Cusco RS vs. OS GIKEN

[Dcocci]

I'd like some feedback on both from people who are tracking these diffs. In particular installation (were there any extra parts needed IE-side shafts), and lock up characteristics. I like how the RS is adjustable, and the MOTO IQ article is very helpful, however they talk about lockup being a little harsh for street tires even after they tuned it. I've heard nothing but great things about the OS giken, and that its smooth as silk on the track. As they are pretty similar in price, I figured I'd ask here first before throwing down boku bucks. Also if you have any other suggestions for a clutch type LSD that performs well on track. I can deal with noise, bad street manners, etc. as I don't drive the car much on the street.Thanks!