Enhance the sound and performance of your 2005–2010 Mustang with the Flowmaster American Thunder Axle-Back Exhaust System. Engineered specifically for the Mustang GT, GT500, and California Special models equipped with the 4.6L or 5.4L engine, this system delivers the iconic deep and aggressive Flowmaster tone with a balanced interior sound level.

Built using 2.50-inch mandrel-bent 16-gauge stainless steel tubing, the system flows into a pair of Super 44 Series performance mufflers—designed for maximum power gains and unmistakable exhaust character. The axle-back is finished with dual 4.00-inch polished stainless steel tips featuring a rolled-edge angle-cut design embossed with the Flowmaster logo.

This system mounts directly in place of the factory components using the original hanger locations, ensuring a quick and frustration-free installation. It includes all required clamps, hangers, and hardware, and features a durable black high-temperature muffler coating along with corrosion-resistant 304 stainless steel tips. Backed by Flowmaster’s Lifetime Limited Warranty, this axle-back system offers long-lasting performance and reliability.

Features:

• Super 44 Series performance mufflers

• 2.50-inch mandrel-bent stainless steel tubing

• Moderately aggressive exterior tone with mild-to-moderate interior presence

• Large dual 4.00-inch polished stainless steel tips

• Quick and easy bolt-on installation

• Uses factory hanger locations

• No cutting or welding required

• Dyno-tuned for maximum performance

• Includes hardware and hangers

Specifications:

• Exhaust Series: American Thunder

• Type: Axle-back

• Material: 409 stainless steel tubing

• Tip Material: 304 stainless steel

• Tip Diameter: 4.00 in

• Tip Finish: Polished

• Main Piping Diameter: 2.50 in

• Muffler Series: Super 44 (Chambered)

• Exit Style: Dual Out Rear

• Sound Level: Aggressive / Moderate

• Clamps Included: Yes

Fitment 

Fits 2005–2010 Ford Mustang
Fits Mustang GT (4.6L engine)
Fits Mustang GT500 (5.4L engine)
Fits Mustang California Special
Fits coupe and convertible models
Fits all submodels equipped with factory dual exhaust

This system delivers an authentic muscle-car soundtrack, improved performance, and premium Flowmaster build quality—making it the perfect upgrade for any 2005–2010 Mustang enthusiast.