Improve performance levels in your WRX with an inlet hose by Perrin Performance. Reinforced with a stainless steel support wire that is embedded in all of the layers, this hose can withstand high horsepower setups. Compared to the 2.7" diameter that comes with your factory hose, the Perrin inlet hose diameter measures at 3.0", allowing for a larger amount of air to enter your engine. The larger diameter will also support all bolt on modifications.