A'PEXi - Power Intake Kit - 2002-2007 WRX/STI

The Power Intake is a high-performance air filter engineered to maximize horsepower and airflow efficiency. Featuring a patented dual-funnel design inspired by racing technology, this intake system channels air with minimal turbulence and restriction for maximum engine performance.

Dual Funnel Technology
Unlike traditional single-funnel intakes that leave the center portion underutilized, the Power Intake uses a primary upper funnel that directs airflow into optimized lower funnels at the base. The lower funnels feature a precision 14-degree curve and are positioned closer to the base to eliminate dead spots and reduce drag. Constructed from high-durability injected resin, the funnels achieve ideal shapes impossible with traditional stainless steel, increasing air speed without disrupting flow direction.

Advanced Filtration
The newly developed layered dry-density fiber element provides maximum protection from contaminants while reducing ventilation resistance by approximately 10% compared to previous models. This dry-type filter eliminates common wet-filter issues like oil contamination on airflow meters and requires minimal maintenance with low-cost replacement filters.

Performance Features

• Dual-funnel system minimizes intake turbulence for smooth, high-speed airflow
• 10% reduction in pressure loss vs. previous generation
• Dry-type filter — no oil, no mess, virtually maintenance-free
• High-density layered fiber element for superior engine protection
• Injected resin construction for optimal funnel geometry
• Direct bolt-on fitment — no modifications required
• Low-cost replacement filters available (P/N 500-A022)

Fitment

• Part Number: 507-F004
• Years: 2002–2007
• Make: Subaru
• Models: Impreza WRX, Impreza WRX STI, Impreza WRX Wagon
• Also Fits: Legacy B4/Wagon (EJ20) 2002–2003, Forester (EJ20) 2002–2008
• Body Style: 4-Door Sedan, 4-Door Wagon
• Engine: EJ20 (Turbo), EJ25 (Turbo)
• Chassis: GDA, GDB, GGB

Important Notes
Off-Road Use Only
⚠️ WARNING: California Prop 65 — Cancer & Reproductive Harm — www.p65warnings.ca.gov