Description
Overview
The Flowmaster American Thunder Axle-back Exhaust System is engineered for the 2005-2010 Ford Mustang GT, GT500, and California Special, covering both coupes and convertibles equipped with the 4.6L or 5.4L engine. Built for the driver who wants a moderately aggressive exterior tone paired with a controlled, moderate interior sound level, this axle-back setup delivers the performance and unmistakable Flowmaster character in a package designed to bolt on with minimal fuss.
At the heart of the system is a pair of Super 44 Series performance mufflers, the components responsible for that iconic deep, aggressive rumble Flowmaster is known for. Exhaust gases flow through 2.50-inch mandrel-bent stainless steel tubing, a design that maintains smooth, consistent flow for maximum performance from your Mustang’s V8. The dual tail pipe layout is finished with polished 4.00-inch stainless steel tips embossed with the Flowmaster logo, giving the rear of your Mustang a clean, purposeful appearance to match the sound.
Key Benefits
This American Thunder system strikes the balance many Mustang owners are after: an aggressive presence outside the car without an overbearing drone inside the cabin. Because it reuses the factory hangers, installation is straightforward, and the kit arrives with all necessary parts and hardware to complete the job. It is also CARB (California) compliant, making it a legal choice in emissions-regulated states, and it carries Flowmaster’s Lifetime Limited Warranty.
- 2.50-inch mandrel-bent stainless steel tubing for smooth, high-flow performance
- Dual Super 44 Series performance mufflers for a deep, aggressive tone
- Polished 4.00-inch stainless steel tips embossed with the Flowmaster logo
- Moderately aggressive exterior sound with a moderate interior sound level
- Uses factory hangers for a simplified, direct-fit installation
- Includes all necessary parts and hardware; CARB compliant and covered by a Lifetime Limited Warranty
Sound & Performance
The Super 44 mufflers are the difference-maker here, tuning the exhaust note toward that signature Flowmaster growl while keeping cabin volume manageable for daily driving. Whether you’re cruising or getting on the throttle, the system rewards you with an authoritative V8 voice and the flow benefits of true mandrel-bent stainless construction.
Fitment
This axle-back system is designed specifically for the 2005-2010 Ford Mustang GT, GT500, and California Special in 2WD configuration, fitting both coupe and convertible body styles with the 4.6L or 5.4L engine. The muffler is supplied as part of the kit only. Note that a heat shield is not included, and this product carries a California Proposition 65 warning.
For Mustang owners who want a proven upgrade that improves both looks and sound, the Flowmaster American Thunder Axle-back Exhaust System delivers a complete, ready-to-install solution backed by the Flowmaster name.
