Rubber is out and silicone is in for your 2015 WRX! The Mishimoto 2015-2021 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 four-layers of silicone and heat-resistant embedded fibers for added strength. This 2015 WRX 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's 2015 WRX 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. Whether you are entering your 2015 WRX in the local rallycross, or lapping at your next track day, trust Mishimoto and our line of 2015 WRX parts to keep your WRX cool. The Mishimoto 2015 WRX Silicone Airbox Hose Kit is available in black, blue, or red to match your styling preference. This kit, like our entire line of 2015 WRX parts, includes the signature Mishimoto Lifetime Warranty.