Grimmspeed Cold Air Intake Red 2002-2007 WRX / 2004-2007 STI / 2004-2008 Forester XT

GrimmSpeed’s intake lineup is known for top-tier performance, easy tuning, and OEM-level fitment—and now early-model Subaru owners get the same treatment. After nearly two years of development, testing, and refinement, this hybrid Cold Air/Short Ram intake delivers the ideal balance of power, consistency, and reliability for your EJ platform.

Quick Specs:

• Hybrid Cold Air/Short Ram Design – Power gains without the drawbacks of either style
• Integrated Air Straightener – Ensures accurate, consistent MAF readings
• High-Flow Reusable Filter – Built-in velocity stack for smooth airflow
• StealthBox Heatshield – Blocks radiant heat and cleans up engine bay appearance
• Made in the USA
• 40-Minute Installation
• Tuning Required

Design & Engineering
This intake was engineered to reduce restriction, simplify tuning, and deliver predictable airflow. Minimal bends, a precision air straightener, and a thoughtfully placed filter keep airflow smooth and safe for tuners. The StealthBox heatshield pulls in cooler air while hiding unsightly factory components for a clean, OEM-plus look. The filter sits high enough to avoid water ingestion, and integrated mounts retain factory coolant hose clips for proper routing.

Materials & Build Quality
Every component is built to GrimmSpeed standards:

• Laser-cut, CNC-bent aluminum heatshield with durable black or red wrinkle powdercoat
• CNC-machined 6061 MAF flange
• TIG-welded, powdercoated 5052 aluminum intake tube
• Laser-cut aluminum air straightener
  No shortcuts—just precision and durability throughout.

Performance & Tuning
This intake is extremely tuner-friendly thanks to its stable airflow characteristics. On a VF39-equipped 2006 WRX running 91 octane, simply swapping the intake (and adjusting AFR to match stock levels) provided:

• +13 ft-lbs and +18 hp gains across the powerband
• Up to 1.5 psi more boost at redline due to reduced restriction
  The result is stronger mid-range punch, improved top-end pull, and consistent, predictable MAF readings for easy tuning.

Includes:

• (1) Intake Tube
• (1) High-flow Dry Filter
• (1) Silicone Hose Coupler
• (1) Heat Shield Assembly
• (3) Hose Clamps
• (2) MAF Flange Screws
• (3) Precut Rubber Sealing Strip
• (3) Airbox to Chassis Bolts

Installation Guide