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AEM Performance Cold Air Intake for the 2018 Subaru WRX STI 2.5L replaces the factory airbox and tubing with mandrel‑bent aluminum tubing and an oversized AEM Dryflow synthetic washable air filter housed behind a heat shield. Tuned and dyno‑tested for specific WRX STI fitment, the system preserves factory emissions devices, uses oil‑free filter media rated for long service intervals, and is backed by AEM’s Lifetime Limited Warranty.
AEM 2018 Subaru WRX STI 2.5L H4 F/I Cold Air Intake System - Wrinkle Red
