GrimmSpeed Top Mount Intercooler Splitter 2002-2003 WRX w/ JDM STI Scoop

Turbocharged Subarus generate serious heat—intake temps can exceed 400°F before reaching the intercooler. Larger aftermarket TMICs have up to 200% more internal volume, but they can’t cool effectively when fed through the narrow OEM WRX splitter.

GrimmSpeed splitters increase opening size by 70%, ensuring your TMIC receives all the ambient airflow it was designed to use. Whether you're running an STI scoop or sticking with your existing setup, you’ll see lower charge temps, more consistent performance, and improved tuning potential.

Quick Specs

• 70% increase in airflow capacity for dramatically improved heat removal
• Maximizes TMIC efficiency and lowers outlet temps for more aggressive tuning
• Optimized, even airflow distribution across the entire intercooler core
• CAD-designed & flow-simulated for perfect fitment and performance
• CNC laser-cut 5052 aluminum—lightweight, rigid, and fatigue-resistant
• Durable DuPont black powder coat for long-lasting OEM-style protection
• Custom EPDM rubber gasket for a strong, leak-free seal
• Three integrated sprayer ports—use your STI sprayer or add your own

Every splitter is engineered in CAD, flow-tested, and shaped specifically to make the most of the air entering your hood scoop. We enlarged the lower opening to match STI and GrimmSpeed TMIC dimensions and completely redesigned the internal vanes to evenly distribute airflow across the entire core. Extra air-diversion vanes are added wherever space allows, ensuring maximum efficiency regardless of scoop size.

Installation Guide