If the I/C water path is linked to the motors coolant circuit (as some cars are), you avoid adding heat to this system by placing the injector ahead of the I/C core. This is for a water/air units obviously.
Placing the injector after the I/C unit will mean the cars system absorbs more of the heat, reducing overall efficiency even though the I/C is more effcient at removing heat from the higher temps.
One could also argue that if the I/C is insufficient to start with - that again overall efficiency would be improved by taking as much heat out of the system before you hit the I/C, allowing the under spec I/C to cope better.
If there is an issue with corrosion on the I/C core I would not know but I expect being mostly ali and the like they should be pretty robust, unless some funky fluid blends are used.
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