Outlaw® exhaust systems are ideal for those looking for the ultimate aggressive exhaust sound levels. These systems feature our race-bred Outlaw mufflers and deliver extremely aggressive sound levels inside and out. On catalytic converter equipped vehicles, Outlaws deliver very aggressive tones and may be street-compatible in some areas. All Outlaw systems are manufactured from 409S stainless steel for maximum durability.
Fitment Information
- Ford Mustang (2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023)
- with the 2.3L Ecoboost or 3.7L engine
Emissions Compliance
This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
Specs & Features
- Muffler Material: 409S Stainless Steel
- Muffler Outlet Diameter (in): 3
- Muffler Outlet Location: Centered
- Muffler Overall Length (in): 10.5
- Muffler Part Number: Kit Only
- Muffler Quantity: 2
- Muffler Series: Outlaw
- Muffler Shape: Round
- Muffler Type: Reflection
- Single Dual: Dual
- Sound Level: Aggressive
- System Type: Axle-back
- Tip Cut: Angle
- Tip Diameter: 4
- Tip Edge Style: Cut
- Tip Finish: Polished
- Tip Length: 5.25
- Tip Logo: Embossed
- Tip Material: 304 Stainless
- Tip Quantity: 2
- Tip Shape: Round
- Tubing Diameter (in): 3
- Tubing Material: 409S Stainless Steel
- Prop 65 - Short Label: prop65_warning.jpg
- Prop 65 (C, R or CR): CR
- Prop 65 Yes/No: Yes
- Title: Flowmaster 15-20 MUSTANG BASE AB OTL 409S
- CARB (California) Compliant: Yes
- Catalytic Converter Included: No
- Exhaust Series: Outlaw
- Exit Position: Dual Out Rear
- Heat Shield: No
- Material: 409 Stainless Steel
- Mount Type: Uses Factory Hangers
- Muffler Body Length (in): 49
- Muffler Color: Black
- Muffler Finish: Painted
- Muffler Inlet Diameter (in): 3
- Muffler Inlet Location: Centered
- Emission Code: 5
Product Description
This Flowmaster Outlaw axle-back exhaust system is specifically designed for 2015-2023 Ford Mustang coupes or convertibles with 2.3L Ecoboost or 3.7L engines. These systems feature race proven Outlaw® mufflers for a very aggressive exterior sound level with a moderate interior sound level. Features include 2.25-inch connections for an easy fit to the stock mid pipe then the inlets quickly expand to full 3.00-inch mandrel-bent inlet tubing leading into a pair of the race proven Outlaw mufflers for maximum performance and sound. The system is supported from the factory hanger locations for an easy and hassle free installation that can be done at home and is finished off with large 4.00-inch highly polished stainless steel tips for that performance look and sound that you've come to expect from Flowmaster. Covered by our Lifetime Limited Warranty. Note: Fits coupes and convertibles
Features:
- Large 4.00-inch Polished Stainless Steel Tips
- Aggressive Race Proven Outlaw Mufflers
- Dyno-tuned for Maximum Performance
- Uses the Factory Hanger Locations
- Full Stainless Steel Construction
- Lifetime Limited Warranty
- Mandrel-bent Tubing
- Easy Installation

More in this category
Flowmaster Exhaust Systems
Ford Mustang Exhaust
Ford Mustang Parts
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