When mine was custom supercharged @8psi with same S/C than DASC (eaton m62) I made it first not intercooled and then intercooled.
The difference was clear, never dynoed but more torque was there, especially in summer or after hours of hard driving.
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This car is from 318ti.org, the owner is ZeroG. He was developing a water intercooler for DASC. Here you can see it:
