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btw, it makes 2lbs idling at 1000rpm

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Your blow off valve should be manifold referanced and your wastegate bottom port should manifold referanced .

You should have vacuum at idle .

There is something out of whack.

You should see the blow off valve open at idle and slam shut when you chop the throttle if you have all that boost.

The exhaust manifold length has nothing to do with it.