it ran fine because it wasn't boosting fully as above. now that you are boosting proper, it generates more heat than it did before and then the ecu is limiting the boost to prevent detonation.
the v1/2 slanty coolers are crap (I have the same) and if the undertray is missing, then it wont get the airflow through the core that it should do so your intake temp goes up after a bit of normal boosting, then the ecu cuts the boost to protect the engine.
I could be wrong, but it's no big deal to lose the brace and pop the undertray back on to see. even if that just means you get further down the road before the boost gets cut again, it's an indication of what could be wrong
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