I have seen quite a few post in regards to the forge DV leaking boost at the high end of the RPM range. this is true! for i had the same issue after installing my Forge DV due the fact that the blue spring in the forge DV is not quite strong enough. after some trial and error.

For stock to mild mods: Use the blue spring with the 2 shims perfect for this type of setup. this works really good for the evo9`s. Im not so sure the for the 8`s though.

The red spring seems to be a tad to much for stock to mild.

this is a heads up for those that did not figure this out.