TurboXS 2015-2021 Subaru STI Front Mount Intercooler Kit

One of the biggest keys to making consistent power in a 2015+ STi is managing the intake manifold temperature.  This is an issue when the STi is bone stock and becomes an even bigger issue when you start to modify it.  The stock top mount intercooler simply isn’t up to the task.  After just a few minutes of hard driving, the small, overworked TMIC quickly becomes heat soaked.  Intake manifold temperatures rise quickly and power output drops off even more quickly.  The power drop is due to the hotter, less dense air coming out of the intercooler.  You could replace the stock TMIC with a well-designed aftermarket TMIC.  While they are certainly much better than the stock TMIC, they can only delay the inevitable intake manifold temperature increase that comes from having a small intercooler core sitting inside a hot engine bay.