Process West Top Mount Intercooler Subaru STI 2004-2005

Process West
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The goal when developing our new top mounted intercooler was to make it the very best aftermarket top mounted intercooler for WRX/STi... period. We studied our competitors products and fixed all of the mistakes they have made...some of them major.

The most obvious error that EVERY one of our competors makes is not supplying their intercooler with proper ducting/shrouding to suit the increased size of the new intercooler. There is no point in installing a larger intercooler and leaving the factory under bonnet splitter/scroud in place. Here is the solution. A properly sized splitter/shroud to suit the application.

Process West intercooler and splitter/combination showing 100% of the new larger intercooler with full ambient airflow over the entire core. intercooler is 90mm thick (3.5in) and in turn the intercooler breathes, gives lower outlets temps and in turn more power. Turbo compessor outlet to intercooler (Y-pipe) design Almost all of the aftermarket y-pipes we see do not distribute the charge air flow along the intercooler evenly. Their y-pipe usually consists of one nicely flowing section with an afterthough spout as the second duct.


  • Intercooler
  • Duct
  • IC Hose

Do to design differences of the 2004-2005 STi and 2006-2007 STi the Splitter itself will only fit on the 2004-2005 Model Years. However the Intercooler itself with fit 2004-2007 Models

Part Number: PWTMIC05


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