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Simple to install and easy to appreciate, the AFTA-MAF is an eloquent compliment to every engine bay. Replaces the factory corrugated rubber hose between the inlet tube and air box.The Perrin MAF hose for the 08-09 WRX & STi is designed to reduce turbulence and improve airflow between the turbocharger inlet hose and factory airbox. This is a good-looking, simple, and effective way to squeeze as much power as possible from your stock airbox.This is for the BLACK finish. Please search our store for the RED version.2008-2010 Subaru Impreza WRX & STi / 2005-2008 Legacy GT / 08-10 Forester XT