Increase charge-air volume without abandoning the factory top-mount layout

GrimmSpeed GRM113049 is the raw aluminum finish version of its billet top-mount intercooler for the supported FA24-powered Subaru applications. A 19 by 7 by 4-inch cross-flow core, CNC-machined end tanks, and a double O-ring throttle-body connection increase cooling capacity while retaining factory-style interfaces.

Key Features

• GrimmSpeed GRM113049 uses the verified raw aluminum finish configuration
• Cross-flow bar-and-plate core measures 19 by 7 by 4 inches
• Core provides 63 percent more volume and 209 percent more flow area than the factory unit
• Four-axis CNC-machined billet aluminum end tanks distribute flow with low pressure drop
• Pre-installed double O-ring throttle-body connection resists boost leaks
• Each unit is pressure tested, cleaned, and sealed before shipment
• Maintains the factory charge-pipe, throttle-body, and hood-duct interfaces
• No tune is required for installation on an otherwise compatible calibration

Fitment

Specifications

What's Included

• One GrimmSpeed GRM113049 top-mount intercooler in raw aluminum finish
• One silicone throttle-body coupler
• Two pre-installed throttle-body O-rings
• Application-specific mounting hardware supplied with the kit
• Charge pipe, bypass valve, tools, and unrelated engine parts are not included

About GrimmSpeed

GrimmSpeed engineers Subaru performance components around measured factory interfaces and in-house testing. Its billet intercooler uses machined end tanks, a large cross-flow core, and a sealed throttle-body connection to increase charge-air capacity without converting the vehicle to a front-mount layout.

Related Parts

• No internal product is linked because charge pipes, bypass valves, gaskets, and tuning components must be confirmed for GrimmSpeed GRM113049 and the exact FA24 vehicle configuration.

FAQ

It is the raw aluminum GrimmSpeed billet top-mount intercooler for the supported FA24-powered Subaru applications.

No tune is required for the intercooler alone, but every other engine modification and calibration must remain compatible.

The cross-flow bar-and-plate core measures 19 inches by 7 inches by 4 inches.

GrimmSpeed reports 63 percent more core volume and 209 percent more flow area than the factory unit.

Yes. The design retains the factory charge-pipe, throttle-body, and hood-duct interfaces on supported applications.

The connection uses a pre-installed double O-ring and threaded retaining interface designed for elevated boost pressure.

No. Use only the exact model years and trims in the fitment table and confirm current manufacturer data before installation.

Pressure-test the charge path and verify coupler seating, O-ring condition, hardware torque, hood-duct alignment, bypass-valve operation, and clearance before driving.

Installation Instructions

1. Confirm the vehicle, FA24 turbo configuration, finish, and GrimmSpeed GRM113049 before opening the charge-air system.
2. Allow the engine to cool, review the current GrimmSpeed instructions, disconnect the battery if directed, and protect all open intake connections from debris.
3. Remove the factory intercooler and only the ducting, couplers, and hardware identified in the installation procedure.
4. Inspect the pre-installed O-rings and coupler, then lower the intercooler into position without forcing the end tanks or loading nearby hoses and wiring.
5. Connect the throttle body and charge pipe, align the mounts and hood duct, and tighten all fasteners and clamps in the documented sequence.
6. Pressure-test for boost leaks, verify hood clearance and bypass-valve operation, start the engine, and recheck every connection after the initial heat cycle.

California Proposition 65 Warning: This product can expose you to chemicals including antimony oxide and other chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit www.P65Warnings.ca.gov.