Improve the exhaust flow on your 1999-04 Mustang 4.6 with this Flowmaster American Thunder cat back. Flowmaster American thunder cat backs provide maximum exhaust flow with a deep throaty muscle car sound with less interior resonance. This cat back provides better acceleration and increased horsepower by reducing back pressure through the mandrel bent tubing.

Flowmaster American Thunder cat backs are designed using mandrel-bent 16-gauge aluminized steel tubing. This 2.5" mandrel bent tubing allows for superior exhaust gas flow for great sound and performance. Installation hardware gaskets and instructions are included for an easy installation.

Flowmaster 3" polished slant edge tip backs the exhaust for great muscle car looks. New clamps are included for installation however welding all slip-fit connections is recommended. Will not fit IRS equipped vehicles