Description
Overview
The Flowmaster Flow FX Cat-Back Exhaust System is a complete bolt-on upgrade engineered specifically for 2004-2008 Ford F-150 trucks equipped with the 4.6L and 5.4L engines. Built to replace the restrictive factory exhaust from the catalytic converter back, this system pairs Flowmaster’s proven straight-through muffler technology with mandrel-bent tubing to unlock maximum performance and a deep, moderately aggressive tone your F-150 was missing from the factory.
At the heart of the system is the Flow FX straight-through muffler, featuring a single center inlet and dual outlet design. A 3.00-inch inlet pipe feeds the muffler for smooth, efficient flow, while the moderate sound level delivers presence without being overbearing on the highway or during long tows.
Built to Last
Every component is manufactured from durable 409 stainless steel throughout, giving you long-term corrosion resistance and rugged reliability in a silver-finish pipe package. The system is finished with a pair of large 4.50-inch black ceramic coated stainless steel tips with an embossed logo, adding an aggressive, purposeful look that matches the performance muffler’s sound.
Smart Routing for Towing
The dual 2.50-inch mandrel-bent tailpipes are custom routed to clear the factory spare tire and tow hitch without any clearance issues. Rather than dumping out the rear, the pipes exit out the sides behind the rear tires — an ideal setup when towing so you’re not blowing exhaust fumes onto your boat, vehicle, or trailer.
Key Highlights
- Direct bolt-on cat-back system for 2004-2008 Ford F-150 with 4.6L and 5.4L engines
- 409 stainless steel construction throughout for lasting durability
- 3.00-inch inlet pipe feeding a single-inlet/dual-outlet Flow FX straight-through muffler
- Dual 2.50-inch mandrel-bent tailpipes with side exit behind the rear tires
- Large 4.50-inch black ceramic coated stainless steel tips with embossed logo
- CARB (California) compliant — Emission Code 5
Easy At-Home Installation
Designed for the do-it-yourselfer, the system utilizes the factory hanger locations and includes detailed instructions along with all necessary hardware for a straightforward install in your own garage. It fits all 2- and 4-wheel drive models and all wheelbases, so you can dial in the right upgrade for your truck with confidence.
If you want a deeper, more aggressive exhaust note, improved flow, and a rugged tip look that stands up to the elements — all while staying CARB compliant — the Flowmaster Flow FX Cat-Back is a proven choice for your F-150.
