a standard short stack intercooler with the core and a Scirocco-type FMHE will heat soak in a 1/4 mile pass or about 15 seconds at WOT on the street and take about 10 minutes of recirculation to cool back down (my experience at the track - YMMV). The core will transfer heat pretty well, but the key to a SSIC is capacity -- you need a big FMHE, reservoir, and a good pump to get good recovery out of it.