The factory rubber throttle body hose on the 2008+ Subaru WRX is prone to failure, especially on vehicles running increased boost pressures. Mishimoto has developed a high-strength silicone replacement hose that provides increased pressure and heat tolerance, thanks to its 100% silicone construction. This hose features five layers of silicone with heat-resistant embedded fibers that withstand substantial boost pressure. The hose is equipped with a position indicator, making installation a breeze and possible in less than one hour. The Mishimoto Subaru WRX Silicone Throttle Body Hose is available in black, blue, and red. ensuring superior product quality and craftsmanship.