On the stock turbo I used to have issues with my coolant temps while going over passes. At one time my coolant temps were so high it took the car into limp mode. The readout from the AP was 260+. The mods on the car at that time were Cobb RMM, Boomba BPV Spacer, and Mountune e30 tune. I had taken the car into Ford at one point because the car was leaking oil. They replaced the inlet pipe on the intake stating it was causing the issues. I ended up getting under the car and looking at it after this and I realized that the oil was coming out of the Boomba BPV spacer. Removed the Boomba BPV spacer and didn't have an issue with oil leaking, but my coolant temps would still skyrocket on passes.
Fast forward to now and I am no longer experiencing these issues. When the issue went away I did several things, replaced the intercooler with the DHM Race Intercooler(opened up the honey comb on front of the car allowing more air to pass), installed the DHM GTX450r kit, and got tuned by DHM. There are more mods on the car now, but this was the point I noticed the car was no longer overheating.
1) The front grill is open allowing more air to pass to the intercooler and radiator
2) Charge temps are way down due to more efficient turbo and intercooler setup.