Serious Cooling for Serious STI Builds

The 20152021 WRX STI is one of the most capable Subarus ever built, but the stock cooling setup leaves plenty of room for improvement. Thats why we put together theGrimmSpeed Max Cooling Bundle pairing ourTop Mount Intercooler Kitwith theCSF 31mm High-Performance Radiator, designed to keep your EJ25 running stronger, longer, and cooler under pressure.

This combo eliminates two major factory weak points, delivering reliable performance whether youre canyon carving, daily driving, or chasing numbers at the track. It’sdesigned to keep your STI cool and consistent, no matter how hard you drive. The GrimmSpeed TMIC drastically reduces intake temps, while CSFs 31mm all-aluminum radiator boosts coolant efficiency with track-tested durability. It’s a must-have pairing for drivers who demand more.

Whats Included

GrimmSpeed Top Mount Intercooler Kit 20082021 STI

• Durable bar-and-plate core for optimal thermal efficiency

• Cast aluminum end tanks with integrated BPV flange

• Direct bolt-on install using factory locations

• Wrinkle black powder-coated finish

• Compatible with factory and most aftermarket charge pipes

• All hardware and gaskets included

CSF 31mm High-Performance Aluminum Radiator

• 1-row, 31mm core featuring CSFs B-Tube Technology

• Full TIG-welded construction with deep-drawn aluminum end tanks

• Wind tunnel, thermal cycle, and vibration cycle tested for real-world durability

• Brazed in a CAB furnace using military-grade clad aluminum (JIS 3003 minimum)

• CNC-machined fittings and racing-style drain plug

• Burst and impulse cycle tested 10,000+ times

• Salt spray tested for corrosion protection

• 30-point dimensional inspection for OEM fitmentno trimming or mods required

Fitment

• 20082021 Subaru STI (EJ25 Engine)

• Both components install with factory hardware and mounting points

• 100% direct bolt-on no tuning or fab work required