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, or red, and it includes the Mishimoto Lifetime Warranty Direct fit for 2008-2015 Subaru WRXINNER DIAMETER: 2.75" OUTER DIAMETER: 3.15"Maximum Temperature: 330°F Constructed with high grade silicone and heat-resistant embedded fibers Mishimoto Lifetime Warranty