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 - percent silicone construction. This hose features five layers of silicone with heat - resistant embedded fibers that wIt'stand 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, and it includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship.