The Mishimoto 2015+ WRX Silicone Airbox Hose Kit is precision engineered as a bolt-on upgrade in both performance and style. The two 100% silicone hoses are crafted with five-layers of silicone and heat-resistant embedded fibers for added strength. This kit includes the upper and lower airbox hoses, both of which provide improved pressure and heat tolerance compared to the stock rubber counterparts. This portion of the intake is subjected to oil particles from the PCV system; these particles slowly degrade the rubber in the stock hoses. Mishimoto silicone hoses are more resilient to this exposure and will outlast the stock components substantially. To promote improved airflow, these hoses have been designed with a smooth internal surface, unlike the accordion-style bends in stock hoses. This kit includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship.