Description
The Flowmaster American Thunder® Cat-Back Exhaust System is designed for 2004–2008 Ford F-150 and Lincoln Mark LT trucks with 4.6L or 5.4L engines. Built for drivers seeking a deep, aggressive exterior sound with moderate interior tone, this system combines Flowmaster’s performance engineering with durable materials and simple installation.
Constructed from 16-gauge mandrel-bent aluminized steel tubing and flowing into a specially designed Super 40™ Series performance muffler, the system improves exhaust flow, horsepower, and torque. Dual 2.50-inch aluminized steel tailpipes exit either behind the rear wheels (ideal for towing) or straight out the back for a muscular appearance. A pair of 3.00-inch polished stainless steel tips complete the premium look.
Installation is simple using all factory hanger locations, and all necessary hardware is included for an at-home bolt-on installation. This emissions-legal system is backed by Flowmaster’s 3-Year Limited Warranty and provides a perfect balance of performance, tone, and style.
Features and Benefits
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Specially designed Super 40™ Series performance muffler
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Dual 2.50-inch tailpipe exits for versatile styling and towing applications
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3.00-inch polished stainless steel tips for a premium finish
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Mandrel-bent 16-gauge aluminized steel tubing for improved flow and durability
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Aggressive-to-moderate exterior tone with moderate interior resonance
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Dyno-tuned for maximum performance
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Uses factory hanger locations for easy installation
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Includes all hangers and hardware for at-home installation
Specifications
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Exhaust Type: Cat-Back
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Muffler: Super 40™ Series, chambered, aluminized steel
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Muffler Dimensions: 10.00" L × 10.00" W × 5.00" H
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Muffler Finish: Black high-temperature paint
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Main Piping Diameter: 2.50"
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Inlet: Slip-fit, 3.00" inside diameter
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Outlet: Dual 2.50" tailpipes
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Tailpipe Tips: 3.00" polished stainless steel, angled rolled edge
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Sound Level: Aggressive / Moderate
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Clamps Included: Yes
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Hangers Included: Yes
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CARB Compliant: Yes (Emission Code 5)
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Prop 65 Warning: Chromium (hexavalent compounds)
Vehicle Fitment
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2004–2008 Ford F-150 4.6L / 5.4L (2WD and 4WD, all wheelbases)
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2004–2008 Lincoln Mark LT 4.6L / 5.4L (2WD and 4WD)
The Flowmaster American Thunder Cat-Back Exhaust System delivers aggressive sound, improved performance, and premium styling, making it the perfect upgrade for your 2004–2008 Ford F-150 or Lincoln Mark LT.
