Mishimoto Subaru WRX Blue Silicone Throttle Body HoseMishimoto Subaru WRX Blue Silicone Throttle Body Hose Mishimoto Subaru WRX Blue Silicone Throttle Body Hose 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