Open up the flow of the charged air in your 2013 - 2018 Ford Focus ST with the Mishimoto hot - side intercooler pipe. The stock hot - side pipe in your Focus ST is plagued with bends, a restrictive inner diameter and muffling equipment which slows the airflow and causes turbulence on the way to the intercooler. Mishimoto's hot - side intercooler kit not only reduces the amount of bends, but also increased the diameter to 2.5 giving it a 14 - percent increase in volume over the stock piping meaning better flow and the added bonus of 8hp and 10ftlbs of torque.While a majority of the stock piping is constructed from aluminum already, the couplers are made from degradation - prone rubber. Our kit includes more durable silicone couplers featuring 5 - layers of heat - resistant fibers and wire reinforcement to ensure that the Mishimoto hot - side intercooler pipe can stand up to the heat. This kit is offered in a polished finish as well as a wrinkle black powder coat, and is covered under Mishimoto's Lifetime Warranty.