2 PSI drop? At what boost? How crap could the core possibly be? A wide, dual-pass with not enough core tube area might cause that much drop maybe... A single pass on like that would have to be terrible to be that bad.
The only issue I see with the intercooler is what affect it will have on the airflow to the main radiator. It may not be the finest design if it's a Chinese crap one off flea-bay, going with an OE 'cooler off something else isn't usually a bad idea because they tend to be quite efficient.
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