
They don't even have to be. I have bad mpg and it is badly designed. Doesn't draw cold air. It draws in hot air from the engine bay causing my Explorer to overheat. I returned the factory intake and the gpm are back up and it's not starting to overheat on the track. Udder shit.

π§ Enhance Performance with Spectre 8711 Vacuum Sensor Adapter Kit
9 Review

π K&N Cold Air Intake Kit: Boost Horsepower on 2015-2016 Ford F150 Turbo Ecoboost, 3.5L V6, 63-2592
9 Review

π aFe Power Magnum FORCE 54-12092-1 Jeep Wrangler (JK) Performance Air Intake Kit (Oiled Filter, 5-Layer Filtration)
9 Review

π Silicone Throttle Body Hose for Subaru WRX 2008-2014 - Mishimoto MMHOSE-SUB-ITBBK (Black)
9 Review