Roush Axle-Back Exhaust – 2015–2026 Ford Mustang V6 & EcoBoost (S550/S650) | Black Tips

Transform the exhaust note of your 2015–2026 Ford Mustang V6 or EcoBoost with the Roush Axle-Back Exhaust — engineered by Roush Performance, Ford's official performance partner, for the S550 and S650 Mustang V6 and EcoBoost platforms. Roush exhausts are developed alongside Ford engineers to deliver a signature, aggressive exhaust character that dramatically improves the V6 and EcoBoost Mustang's sound profile — a deep, throaty note under acceleration that remains refined at idle and cruise. Black tips add a purposeful, blacked-out aesthetic. Axle-back installation means no tune is required.

⚠️ V6 & EcoBoost Only – Not Compatible with Mustang GT (5.0L): This exhaust is engineered specifically for the Mustang V6 and EcoBoost variants. It is NOT compatible with the Mustang GT (5.0L Coyote V8). For the GT, see the appropriate Roush GT axle-back.

Fitment Note: The V6 (3.7L) was available in the Mustang from 2015–2017 only. The EcoBoost (2.3L) covers the full 2015–2026 range across both S550 and S650 platforms. Verify your specific engine before ordering.

Key Features

• S550 & S650 Coverage – 2015–2026: Fits the full 2015–2026 Mustang V6 and EcoBoost range across both the S550 (2015–2023) and S650 (2024–2026) platforms — a long-production fitment covering over a decade of Mustang EcoBoost models
• Roush Signature Exhaust Note: Engineered by Roush Performance — Ford's official performance partner — to deliver a signature aggressive exhaust character tuned for the V6 and EcoBoost Mustang. Transforms the exhaust note into something worthy of the Mustang nameplate
• Black Tips – Blacked-Out Aesthetic: Black exhaust tips deliver a purposeful, blacked-out appearance at the Mustang's rear end
• Axle-Back Design – No Tune Required: Axle-back installation replaces only the exhaust from the rear axle back — no modifications to the catalytic converters or mid-pipe. No tune required
• Direct OEM Fitment: Direct bolt-on replacement using OEM mounting points for a clean, factory-integrated installation
• Roush Performance Quality: Manufactured by Roush Performance — Ford's official performance partner with decades of Mustang-specific engineering expertise

Specifications

• Type: Axle-Back Exhaust
• Tip Finish: Black
• Tune Required: No
• Engines: 3.7L V6 (2015–2017) / 2.3L EcoBoost (2015–2026)
• Fitment: 2015–2026 Ford Mustang V6 & EcoBoost (S550/S650)
• Part Number: 421837-BLK

Note: Not compatible with Mustang GT (5.0L Coyote V8). V6 fitment applies to 2015–2017 only — the V6 was discontinued after 2017. EcoBoost fitment covers 2015–2026. Verify your specific engine and model year before ordering. Professional installation recommended.