Will I need to pull my engine to really fix this? I've gotten under the car a couple times and tightened down the bolts/studs connecting my BNR's to the manifold, though the invariably loosen again within a couple days/week. I am (obviously) worried about excessive heat leaking out of this joint and into the engine bay. At this point I'm not sure if the gasket is toast or not, if it is than I'm afraid the easiest way to replace it would be to pull the engine since there is so little room to get the turbo's off inside the bay.

Has anybody got any pointers/suggestions?

This problem developed while doing a Tunnel Run through London a couple weeks ago, my PFC registered water temps of up to 110 deg Celsius while in traffic (immediately hit fans to full blast, cranked the heat, etc and dropped the temps to below 100), which is pretty worrisome, but not *too* dangerous...

 

You can pull the turbos without the engine. I'd start there, so you can inspect the gaskets.

 

I just got finished with my car yesterday with the same leak, it took me all day to do. what a pain in the *** to do. Just start with the charge pipes then work your way down from there.