You need hi flow. Don't go backward. If you don't see oil or dirt with the white glove inspection, your're induction system should be ok. Just be careful not to over oil the filter and make sure the seal is good. Otherwise go for another type of high flow filter, but don't go backwards!
If you do have oil and dirt in the intercooler, I'd be afraid to do anthing but disassemble the induction system and flush the intercooler, hoses, etc.
I was kidding about spraying a cleaner into the turbo and through the induction system!!!