Before jumping to any conclusions, make sure that the BOV really is the problem. Attach a 20 psi compressed air source to one side connector, and make sure that it doesn't leak. Then, use a vacuum pump on the top connector and make sure that it opens.
Unlike most aftermarket BOV's, the stock BOV only opens when vacuum is present in the intake manifold. If you look at the BOV, you will see that it would be very difficult to make it leak unless something is broken.
If your BOV is leaking after all, replace it with another stock BOV or possibly 2 BOV's in parallel. Leave the aftermarket BOV's for the single turbo guys who really need them.
Unlike most aftermarket BOV's, the stock BOV only opens when vacuum is present in the intake manifold. If you look at the BOV, you will see that it would be very difficult to make it leak unless something is broken.
If your BOV is leaking after all, replace it with another stock BOV or possibly 2 BOV's in parallel. Leave the aftermarket BOV's for the single turbo guys who really need them.