I would check the ring clamps that go around the DPs that connect the DPs to the turbo.
The reason why I say this is because I've done the DP installation 4 times.
Sometimes I think that the ring clamp is around the DP and the turbo but it's off a bit.
It would be easy to assume that the clamp is on, tighten it, and go on your merry way when it's not.
Double check the installation or take it back to the place that did the install and tell them to check it.
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