2004 Subaru WRX - Keeping Under Pressure Cool - Tech Knowledge

Depending on your year/model car, you may have to replace your stock radiator overflow reservoir with Perrin's included unit. Assemble it as shown here and follow the included mounting directions for your particular make/model WRX, or do what we did, and just make it up as you go.

If you were using the WRX's stock airbox previously, you'll need to upgrade it to the Perrin intake to accommodate the new intercooler plumbing.

Bolt up the lower tubing. And you're almost finished! Before you bolt back on your front bumper cover, you'll need to trim it a little to clear the new Perrin FMIC and plumbing. Here is the only tricky part of the install. Check out our pics of Mark's bumper after modification to get an idea of how yours should look, and use an air grinder or Dremel to do the job and Trim little by little, using tape to mark straight lines. test-fit the bumper as you go, then straighten out the intercooler and tighten it down. This part takes some time, so be sure not to rush yourself for best results.