Many prototypes entered, but only one came out on top. The engineers went through multiple different designs for this 2014 - 2017 Fiesta ST intercooler, weighing the benefits and downfalls of each. The final design consists of a tube - and - fin style intercooler in order to allow airflow to the radiator and reduce overall weight. The core size is 51 - percent larger than stock, and also provides a 25 - percent increase in internal core volume. During testing, this 2014 - 2017 Fiesta ST intercooler dropped intake temperatures by a huge 26 F This kit is designed to be a direct fit, and fits with the stock or Mishimoto 2014 - 2017 Fiesta ST Intercooler Pipes. Combine the two, and you'll have a complete high - performance charged air system. This 2014 - 2017 Fiesta ST intercooler kit includes air diversion plates to channel air through the cooler for maximum efficiency. The all - aluminum, TIG - welded construction is of the highest quality, and like all Mishimoto 2014 - 2017 Fiesta ST parts, it is backed by the Mishimoto Lifetime Warranty