Roush 421145 Axle-Back Exhaust for 11-14 Ford Mustang V6 3.7L

Vehicle Fitment

• 2011-2014 Ford Mustang (3.7L V6, Rear-Wheel Drive)

Features

• Performance-oriented axle-back exhaust system for enhanced sound
• Open-chambered mufflers reduce backpressure for improved airflow
• Dual polished 304 stainless steel round tips with chrome flashing
• 409 stainless steel piping and muffler bodies for corrosion resistance
• Eliminates in-cockpit drone for comfortable cruising
• Bolts on using factory hanger points - no cutting required
• Enhances horsepower and torque through better exhaust flow
• Designed to complement factory or ROUSH rear valance styling

Specifications

• Part Number: 421145 / RSH421145
• Application: 2011-2014 Ford Mustang V6 3.7L
• Drivetrain: Rear-Wheel Drive (RWD)
• Exhaust Type: Axle-back system
• Piping Material: 409 stainless steel
• Tip Material: Chrome-flashed 304 stainless steel
• Tip Diameter: ~4.0" (round tips)
• Installation: Clamp-on / bolt-on using factory hangers

Included Components

• 1x Left muffler assembly
• 1x Right muffler assembly
• 2x Chrome-flashed round exhaust tips
• 2x Inlet pipe spherical clamps
• 2x Exhaust tip clamps
• 1x Installation instructions

Product Description

The Roush 421145 Axle-Back Exhaust is a performance exhaust upgrade designed specifically for 2011-2014 Ford Mustang V6 models equipped with the 3.7L engine. This dual-muffler system features open-chambered construction that enhances exhaust flow, helping to reduce backpressure and give your Mustang a more aggressive tone under acceleration while minimizing unwanted cabin drone at cruising speeds. The polished 304 stainless steel round tips with chrome flashing not only look great but are also built to resist heat-induced discoloration.

Installation is straightforward and uses the vehicle's existing hanger points, meaning no cutting or welding is required for most installations. With durable 409 stainless steel piping and quality clamps included, this axle-back system delivers both rugged longevity and a bold exhaust note that complements daily driving and spirited performance use alike. Whether paired with factory rear valance or a ROUSH-style rear upgrade, the 421145 adds both aesthetic and acoustic enhancements that performance enthusiasts will appreciate.