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Where is the boost gauge hooked up to? I don't see a line for that? When you disconnect that line your internal waste gate's signal is not interrupted so it will only run whatever psi the spring inside the actuator is set too. So something might be wrong with your manual boost controller where it's causing the engine to over boost and that could cause you to run lean and then have high egt(exhaust gas temp). This is a shot in the dark though everyone can speculate about what's wrong but the easiest way is to try and eliminate as many variables as possible till the problem goes away then start adding stuff back on till you figure out what's wrong. Like if it were me I would get a wideband from someone and a egt with gauge and watch those two as yoru car gets into boost and see what your dealing with.
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