Have a look at the temperature that all of those items work at.
If your intercooler is working at 80deg C and the air coming off your radiator is already 70deg C then your intercooler will do stuff all being after the radiator.
You know your radiator works at 80-110 deg C (on the inside).
IMHO you want the Intercooler first. If you need bigger cooling then you will want a bigger radiator, more efficient fans and maybe you could look at adding an oil cooler.
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