If I had to guess Id say they probably pipe a duct to the intercooler to blower over it to cool the charge.. BITD Holley used to offer a NOS kit for the Subaru WRX and it was eccentially the same idea; they had spray bars that went across the intercooler and it would spray nitrous across it to lower the temperature.. They actually used my old 2003 WRX as the test car..
