Neil Simons used one of these on his turbo-nutter car: https://www.chargecooler.co.uk/. Worked really well IIRC
I did a DIY job on my supercharged car. Grafted a cooler core from a Jag V8 into a spare Alfa plenum then had the coolant pump and a motorcycle rad with fan, the whole lot under ECU control. I also fitted water/meth injection but it wasn’t really needed, charge temps never got that bad.
A water based system can potentially handle a lot more heat than an air/air intercooler but has the penalty of added complexity and weight. Another benefit of a water based system for a mid/rear engine is packaging of course, a small coolant rad up front is easier to deal with than a massive air/air intercooler at the back somewhere.
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