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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.
seafoam instructions are on the back of the can and I believe you draw it in through a vaccum line and many use the brake booster as a storage for it then once the car is started the seafoam is drawn out of the brake booster via vaccum into the intake and to the cumbustion chambers where it does it's job and be prepared for some smoke to roll out the pipes!!! some may do 2 treatments of seafoam to get the job done well, depending on the degree of carbon build up in the engine..most effective way is drawn into the brake booster, read the instructions well!!
#1, the stock air box isnt that restrictive, you wont gain any real noticeable power or et.
#2 the stock air filter does its job much better, filters alot better.