The K&N 69-8006TTK Typhoon air intake system is a mandrel-bent aluminum tube induction system designed for certain Subaru WRX Turbos. It replaces the factory air filter and air intake housing to reduce air flow restriction. This optimizes power and acceleration throughput the engine's RPM range while deepening acceleration sound. The filter is a K&N high-flow type with a black rubber top, and installation uses existing factory points. The intake tube is powder-coated black, and the filter is reusable for up to 100,000 miles. It's 90 minutes or less to install with basic tools. Legality varies by state, so check CARB status for each application.