K&N Fuel Injection Performance Kit 1999-04 Mustang 3.8L.

Ford: 1999-2004 3.8L Mustang, Fuel Injection Performance Kit

Add some extra horsepower to your fuel-injected engine with this K&N Filtercharger Injection Performance Kit. It replaces your engine's stock air cleaner or airbox with a low-restriction K&N filter assembly that increases airflow to your engine. And as we all learned in Hot Rod 101, more air means more power--up to 19 more horsepower. Plus, the filter can be covered by up to 1/8 in. of debris before air restriction makes cleaning necessary. The kit includes an air filter assembly, plenum (where applicable), mounting hardware, and instructions.