I don't know if the alloy ones have improved over the years but remember one of my customers fitting one of the first.
He was complaining that it was very flat with much reduced power he'd tried a new MAF, the injectors were recent and came over to me to see what was going on.
It was horrible lack of boost pressure in live data when driving and MAF figures well out of spec.
Advised him to refit his old intercooler which he had luckily kept and an hour later he came back after refitting it and it was back to where it should be.
He complained to the company and they refunded his money and said they'd get back to him, they never did.
Fact is you won't get performance by increasing the airflow in the intercooler, all it does is reduce the MAF readings
Russ