Better yet, how are you going to get 400 WHP out of it?
I really don't understand this thread at all.
You can put a limited slip of some kind in any rear end. You pick the carrier based on your budget and goals. Then you buy new axles and differential. You pick the type of unit you want such as a "posi", locker or torsen. There are pros and cons to each type, you'll want to do research into and decide what's best for you.
Then you'll want to pick a gear ratio.
Spirited driving isn't what kills the rear end. Hook does. If you're not going to hook, you're not going to stress those components that much. But bang shifting will also aggravate the rear end as well. If you're playing canyon carver, you'll likely leave it in third and just use power.
Posi has clutches, they slip and wear out. So it works for a while, then you need to rebuild it.
Locker locks completely, won't help in corners, if anything the inner wheel might hop because it needs to turn slower than the outside wheel.
A torsen multiplies torque, more simply, it allows variable slip while still applying as much torque as possible. Since it multiplies torque, when traction is lost, there is no output. Sounds bad, and it can be if you don't know what to expect. But any RWD vehicle with power being applied around a corner can be.