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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
plastic does heat up, the metal get less hot than the plastic does...it will conduct less heat by the filter part and stay cloder longer than plastic....and the CIA is less restrictive cause it has smooth blends and flows smooth....as oppose to the stock box has those ridges, when air passes through it hits those ridges and causes turbulance. thats why the real gain from a CAI is like 5 horse and under, cause it helps the flow smooth...with the stock box adding a K/N will only give you 2-3 horse, for the free flowing filter.
I had extra pipe laying around A freind had some of those rubber connectors from his old one. The shop charged me $15 to weld it after hours and the air filter came off of ? Just a round 3in. cone k@n I sum how ame across that had been sitting in my tool box for a few years. All total with afew odds and ends about 25 dollars not including the cleaning kit for the k@n.