24-26 Ford Mustang GT 5.0L V8 / 2.3L EB V6 Flowmaster 818159 Outlaw Axle-Back Exhaust System

Flowmaster Outlaw Axle-Back Exhaust System

Part Number: 818159

The Flowmaster Outlaw Axle-Back Exhaust System 818159 is designed for 2024-2026 Ford Mustang GT 5.0L and EcoBoost 2.3L models equipped with the factory performance exhaust option. This performance exhaust upgrade delivers an aggressive Outlaw exhaust tone, improved exhaust flow, and a custom appearance with quad 4.00-inch black ceramic coated tips. The system uses Flowmaster Outlaw reflection mufflers and durable 3.00-inch mandrel bent 409 stainless steel tubing to help maximize airflow and provide long-lasting corrosion resistance. Dyno testing measured maximum gains of up to 17 horsepower and 17 lb-ft of torque at the rear wheels over the stock exhaust. Designed for both coupe and convertible Mustang applications, this axle-back system includes the required hardware and uses factory hanger locations for a streamlined installation.

Key Features

• Flowmaster Outlaw series performance mufflers provide an aggressive, deep, powerful exhaust sound.
• Maximum measured gains of up to 17 horsepower and 17 lb-ft of torque over the stock exhaust at the rear wheels.
• 3.00-inch 16-gauge mandrel bent 409 stainless steel tubing helps maintain maximum exhaust flow for improved performance.
• Quad 4.00-inch black ceramic coated stainless steel tips create a custom high-performance appearance.
• OEM-style valves are included and reuse the factory valve actuator.
• Uses factory hanger locations for easier installation and proper fitment.
• Includes necessary installation hardware for a convenient upgrade.

Benefits

• Enhances the Mustang driving experience with a bold and aggressive performance exhaust tone.
• Improves exhaust flow while maintaining durable construction for long-term performance.
• Adds a customized rear appearance with black ceramic coated quad exhaust tips.
• Provides a performance-focused axle-back upgrade without replacing the entire exhaust system.
• Built with quality materials and backed by Flowmaster's Lifetime Limited Warranty for added confidence.

Product Specifications

• Brand: Flowmaster
• Part Number: 818159
• Product Type: Axle-Back Exhaust System
• Exhaust Series: Outlaw
• Sound Level: Aggressive
• Main Piping Diameter: 3.00 inches
• Piping Material: 409 Stainless Steel
• Pipe Color: Silver
• Exhaust Tip Diameter: 4.00 inches
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Finish: Black Ceramic Coating
• Exhaust Tip Shape: Round
• Exhaust Tip Cut: Angled
• Exhaust Tip Length: 5.25 inches
• Exhaust Tip Quantity: 2
• Exhaust Exit Style: Dual Out Rear
• Muffler Type: Reflection
• Muffler Quantity: 2
• Muffler Material: 409 Stainless Steel
• Muffler Finish: Black High-Temperature Paint Finish
• Muffler Dimensions: 4.00-inch height x 4.00-inch width x 6.50-inch length
• Mount Type: Uses factory hangers
• Clamping Type: Flat Band
• Valve Type: OEM-Style Valves
• Valve Included: Yes
• Catalytic Converter Included: No
• California Proposition 65: Yes
• Emission Code: 5

Install Difficulty Level

This Flowmaster Outlaw Axle-Back Exhaust System is designed for a straightforward installation using factory mounting locations and included hardware. The installation difficulty is considered simple, with an approximate installation time of 2 hours when proper tools and equipment are available. :contentReference[oaicite:0]{index=0}

Vehicle Fitment

• 2024-2026 Ford Mustang GT Coupe and Convertible with 5.0L V8 engine and factory performance exhaust option
• 2024-2026 Ford Mustang EcoBoost Coupe and Convertible with 2.3L engine and factory performance exhaust option

For questions about this product or to report product description inaccuracies, contact the MPT Performance experts at (407) 636-7077 or by email.