You would need to get one that's the same ratio, so a 4.44 (*I think!) for you model. So it keeps your gearbox up front happy.

Depending on which part of it is causing the whining, there may be a chance you can just change the centre out for a brand new aftermarket LSD, eg: Kaaz, Cusco etc, which definitely would be more fun, but a bit more mucking around.

Hard to tell which part of the gears inside would be causing the whining though. I get the feeling it might not be the centre. Have you tried dropping the oil and putting some good quality fresh stuff in?

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Should have bought an STI