True, 6 psi will not heat the air enough to cause any problems, but isn't there a point where wide open throttle long enough will cause radiant heat from the turbo to pass to the cold side, and heat the air much more? This is all second hand knowledge so don't quote me on any of this.
I am a HVAC master tech, and although different, the principle remains the same, you must have air passing over the coil, to dissipate the heat if there isnt enough air its just going to boil.
I have supercharged/ turbo cars, all i can say in my experience with my high hosepower cars is that, those intercoolers, while maybe looking nice, are MUCH to thick, dont have any real airflow passing over them, once heatsoaked will be useless.
There is a reason why the thin front mount intercoolers are so expensive, meth will work much better, than those thick radiators.
If i do decide to further cool my turbo setup, it will be both frontmount and meth, I have a paxton kit that will be going on my dodge viper(these cars run HOT n/a), and spent months talking with the best tuners. seeing different setups etc, the cooling that I went with, that was most proven, was a front mount that was 2 inches thick, but has a large surface area, and meth to put the icing on the cake.
bikes are no different, that is my experience with FI motors and it has worked the best for me.
as with my bike I just upgraded to the latest and greatest gt30r dbb turbo, I had an older t28 that i never has a single problem with when it can to heat, i do have a bypass fan control on the bike now, and if i have heat problems with my setup, ill go with meth first than a front mount.
People underestimate how great meth is.
Procharged 92 fox owner, buick grand national owner, the kit for my viper goes on next summer, my busa is in the shop right now and will be fitted with meth and a front mount, or maybe just meth as the motor is built to the hilt, only thing that wasnt changed was displacement and cams.