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I have heard from a few sources, including the Edmunds test, that the Fiesta ST intercooler does a better job than the Focus ST version. From running 30+ autocross laps in 95'F temps this summer, the performance of the car seemed to stay constant. I sprayed the tires and intercooler down with water using a spray bottle. I noticed way more heat issues with a normally aspirated engine with an aftermarket intake than I did with the ST.