[The Radium King]

compressing the air will heat it. the location of the sc (typically near the exhaust where there is room in the cramped boxster engine compartment) will cause heating/heat soak. increased intake air temperature (iat) is detrimental to performance; it's one of the primary inputs the ecu monitors to determine fuel delivery. aside from performance, anything you can do to remove heat from the system (air, oil, coolant) is good.

edit to add - uncertain where iA located their sc, but if near the exhaust, consider (a) wrap or ceramic coat the exhaust, and (b) blanket for the sc (I think a turbo blanket could be repurposed for your sc pretty easy).

initial boxster forced induction kits didn't have intercoolers because there was nowhere to put them without hacking the car up (ie, no longer a bolt-on procedure for the weekend warrior). when porsche added the third radiator in 2000 then the tuners started repurposing these for use in air/water intercooling systems. the same thinking applies to tuning; the bosch 7.x dmes took a while to break; until then the forced induction kits addressed the change in fueling requirements with hacks like 7th injectors and resistors in the maf wiring, etc. now that we can tune the oem ecu there is no real need (except cost) to mess around with sub-par solutions. note that piggyback computers have also become quite sophisticated in the past 15 years; a wideband 02 sensor tied to a piggyback might do the trick for you also - check with insite or jaay about their experience with these.