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Is their any HP gain for running a larger intercooler on a supercharged Mini with 15% pulley, colder plugs & Alta intake/exhaust ?
HP gain? Not really...
What a better Intercooler will do is allow you to keep any HP you may lose to excessive intake heat. Which is far more often a track issue than a street issue.
It will also increase the volume of air between the SC and intake ports which means it takes longer to build boost when the BPV closes. So, there’s a trade off.