Increase horsepower and style under the hood of your 2015 STI. Perrin's engineering research team has discovered that proper MAF sensor alignment and plumbing size are crucial to maintain proper air fuel ratios and prevent nasty check engine lights that can plague the competition. With this intake system alone you will see consistent gains in horsepower and throttle response. Each Perrin Performance cold air intake kit for the 2015 STI includes powder coated aluminum and silicone tubing, a Perrin air filter, MAF sensor housing, mounting hardware and instructions.