The Mishimoto Subaru WRX WRX STi Silicone Induction Hose is made from a combination of high - grade silicone and heat - resistant embedded fibers for a high - quality replacement for your OEM rubber hose.The Mishimoto silicone Induction Hose is wire reinforced to prevent collapsing under pressure and features increased flow thanks to a larger internal diameter.Available in black, blue or red, the Mishimoto silicone induction hoses retain OEM fitment, the ultimate upgrade in performance and style.