well,since we r talking bout kcar,having a heat shield does not make so much of a difference,unless we r talking of a bigger car with bigger engine bay...u r correct bout the function of an intercooler,however come 2 think bout it,eventhough subaru has top ic with bonet scoop,why does some of the model have a button that can spray water on top of the ic,bcoz they claim that the ic wont cool the air enough,to me it does make sense,let us say the air that goes in is already cool,therefore it wont be such a hassle for the ic to cool it down further,however if the air is so hot n then the ic only cool it slightly,it wont give u extra ummmphh...u get what im trying 2 say...,not all ic have the same efficiency in cooling the air,sometime u cant depend 100% on ur ic alone,u hv 2 think about the air that goes in 1st,even evo is more powerful having a heat shield,proven by dyno,not much but every hp count...it sure give some advantage eventhough ur right foot doesn't feel so much of a difference...