Did the heat wrap on the dump today and finally got around to taking it for a quick burst with the new turbo bag (in the 38 degree heat)... All went really well, got back and could put my hand on the turbo bag for a few seconds so I guess the heat would have been around 70deg which would be several hundred lower than what it was originally. Dump was also cool enough for a quick touch.
The whole engine bay is now a fair whack colder, so job done. Now just time to get it back on the dyno