I installed a high speed fan and it didn't work. I put baffling in the front fascia to force more air through the radiator and it helped a few degrees but not enough. I've run with 2 heat exchangers and the maximum IAT's stay the same. It takes a longer to warm up but they settle out at more or less the same temperature with 1 or 2 heat exchangers. I just installed water injection. It's going to be a while before I can verify what it does to the temperatures.

Les