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GrimmSpeed Top Mount Intercooler Splitter – 02-07 WRX/STI

GrimmSpeed Top Mount Intercooler Splitter – 02-07 WRX/STI


These splitters are designed to seal perfectly with your GrimmSpeed TMIC, ensuring that the system works as efficiently as possible. With the dense cores that we use, forcing ambient air through the core with a properly fitting splitter is more important than ever and these splitters will allow you to do that with ease.




OEM Splitter choking your TMIC? Fix that.

Our cars, with even mild modification, create some serious heat. As the turbo compresses your intake air, it heats up and it’s not unusual to see air temperatures of over 400* F entering your intercooler. For that reason, you’ve probably upgraded to a larger, more capable top mount. That intercooler uses ambient air flowing over your hood and through your scoop to cool the hot compressed air and if you’re still using the OEM WRX size splitter, you’re not getting the most out of your TMIC. The GrimmSpeed line of splitters increases the size of the opening by 70% to your larger TMIC. Larger TMICs can increase your internal core volume by as much as 200% and you’re going to need every bit of that additional ambient air to keep things cool.


Each of these splitters has been designed to make the best possible use of the air entering your scoop and we offer a fitment for every 02-07 Impreza with a WRX or STI scoop. We’ve opened up the bottom of the splitter to better fit your STI or big GrimmSpeed TMIC and we’ve redesigned the vanes that direct air from your scoop down to your intercooler. In addition, we’ve added features for up to three intercooler water sprayers to each splitter. Each splitter was designed in CAD and tested via flow simulation prior to production. Extra air diversion vanes were added to the splitters where there was space. Where there wasn’t space (due to a smaller scoop), vanes were re-designed to more evenly distribute airflow.

Quick Specs

  • 70% Increase in flow capacity to your TMIC – Massively improves your TMIC’s ability to remove heat
  • Maximizes TMIC Efficiency – Lowers TMIC outlet temps, enables more aggressive tuning
  • Designed for even flow distribution – Forces entire core work to cool the hot charge air
  • CAD design and simulation – Ensures both fitment and function
  • CNC Laser Cut 5052 Aluminum – Resists fatigue due to heat and vibration
  • Durable DuPont Black Powdercoat – Protects splitter with an OEM finish
  • Custom EPDM Rubber Gasket – Provides excellent seal and longevity
  • 3x Intercooler Sprayer Ports – Utilize your STI TMIC sprayer or add one if you’d like


Additional Information

Weight 4.8 lbs
Dimensions 30.5 × 12.7 × 12.4 in
Vehicle Fitment

02-03 WRX (w/OEM Scoop), 02-03 WRX (w/JDM Scoop), 04-05 WRX (w/OEM Scoop), 04-05 STI (w/OEM Scoop), 06-07 WRX/STI (w/OEM Scoop)


  • 2002-2003 WRX w/OEM Scoop (equipped with a GrimmSpeed or OEM STI TMIC)
  • 2002-2003 WRX w/JDM Scoop (equipped with a GrimmSpeed or OEM STI TMIC)
  • 2004-2005 WRX w/OEM Scoop (equipped with a GrimmSpeed or OEM STI TMIC)
  • 2004-2005 STI w/OEM Scoop (equipped with a GrimmSpeed or OEM STI TMIC)
  • 2006-2007 WRX/STI w/OEM Scoop (equipped with a GrimmSpeed or OEM STI TMIC)
  • 2004-2005 Saab 9-2x Turbo (equipped with a GrimmSpeed or OEM STI TMIC)


Installation Guide

Install Guide