[Hotshot8792]

what turbos are you running? Just curious. Anyways, my guess is that your wastegates are disconnected. Doing this will cause a slight boost leak, but at the same time your turbos will be spinning as fast as possible which could cause a 20 psi spike. If you don't know where to check, locate each of your turbos. On the compressor side (the side that connects to the intake) look for an additional looking piece that sits on top of the turbo and has a small vacuum hose coming from it. Follow the vacuum hose until you see the end of or get to the boost controller, then make sure the other line is connected to the back of the y-pipe. If everything looks connected then unplug your boost controller and plug the hose directly into the back of the y-pipe, then go for a test drive. If your running somewhere around 6 psi then something is wrong with the boost controller. If your still running 20 psi, then something is wrong with the wastegates. Those are the only 3 problems that could cause whats happening to you.