Borla 11951 S-Type Axle-Back Exhaust w/Active Valves for 18-23 Ford Mustang GT

Vehicle Fitment

• 2018-2023 Ford Mustang GT (5.0L V8, RWD, Coupe & Convertible, Active Valve)

Fitment Notes

• Requires factory Active Valve Performance Exhaust (retains OE valve actuators).
• Not for EcoBoost, V6, or non-Active Valve GT models.
• Platform: S550 Mustang (facelift 2018-2023).

Features

• S-Type sound profile: aggressive tone with refined cruising manners.
• T-304 stainless steel construction for superior corrosion resistance.
• Mandrel-bent tubing for smooth flow and throttle response.
• Dual 4.0" rolled-edge polished tips for a premium finish.
• Direct bolt-on to OE tailpipes; no cutting or welding required.
• Precision-fit CNC-formed hangers align with factory mounts.
• Compatible with OE active valves; retains drive-mode functionality.
• Million-mile warranty coverage on materials and workmanship.

Specifications

• System Type: Axle-Back (rear muffler section)
• Tubing Diameter: 2.5" inlet (to OE), 2.5" outlet sections
• Tip Size/Style: Dual 4.0" round, polished, rolled-edge
• Material: T-304 stainless steel (mufflers, tubes, tips)
• Configuration: Left/right rear muffler assemblies with valve provisions
• Drivetrain: RWD
• Position: Rear (aft of axle)
• Sound Level: S-Type (sport/aggressive)

Included Components

• 1x Left-side axle-back muffler assembly with 4.0" tip
• 1x Right-side axle-back muffler assembly with 4.0" tip
• 2x Band clamps (to connect to OE tailpipes)
• 1x Hardware/instruction packet

Product Description

The Borla 11951 S-Type Axle-Back transforms the 2018-2023 Mustang GT's character with a deeper, more assertive tone while preserving day-to-day drivability. Built from premium T-304 stainless steel with mandrel-bent tubing and precision-fit hangers, this bolt-on system replaces the rear muffler section and retains the factory Active Valve actuators to keep your selectable exhaust modes fully functional.

Dual polished 4.0" rolled-edge tips sharpen the rear appearance, and the S-Type acoustic tuning delivers crisp bark under throttle without overwhelming cabin boom. Designed specifically for the 5.0L GT with Active Valve, this axle-back provides durability, fitment accuracy, and long-term performance backed by Borla's renowned warranty.