Personally not a fan of Rear mount set ups. Laggier than traditional set ups, a lot more headaches as mentioned chasing leaks and keeping things cool/hot.
Especially running a bigger turbo outside of it's efficiency range (very low psi) you'll have a poor powerband, which when combined with a rear mount set up will compound the problem.
If you're only looking for 380-400whp, full bolt ons, small cam, and a tune will get you in that range and will be much faster than 380-400whp with the turbo set up you're considering. With a cam in that range as well the car will retain stock driveability, just with more power across the rpm range.
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2000 ws6
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