Subaru Nepal - Almost every STI has a button on the interior that allows you to manually spray cool water on the intercooler. It might sound strange, but it boosts power by
Subaru Impreza Spec C 12L Intercooler Water Spray Bottle
Custom S209 intercooler sprayer almost complete for the Crosstrek STI : r/ WRX
Subaru Impreza WRX STI Intercooler Water Spray Jets Nozzles 2001-2007 OEM JDM | eBay
How to Intercooler Sprayer DIY | AIT Build Yourself