If you are running a stock intake on your 2015-2017 Mustang GT, EcoBoost, or V6, chances are it has a resonator. This extra appendage is an OEM requirement for noise cancellation, it is ugly and needs to be amputated. Pop this cap in after you cut off your resonator, for the clean look.
To install, you will need to cut the stock resonator at the base with either a dremel cut-off wheel or sharp blade. Then pop the cap in and you're done!
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