Roush Performance 421915 Extreme Axle-Back Exhaust System 2005-2010 Mustang GT/GT500

The Roush Performance Extreme Axle-Back Exhaust System delivers an aggressive, race-inspired exhaust note for 2005-2010 Mustang GT (4.6L V8) and 2007-2010 Mustang GT500 (5.4L V8) models. Engineered for maximum performance and sound, this exhaust system features a straight-through resonator design that significantly reduces backpressure while producing a deep, powerful tone that announces your presence on the road.

Construction and Design:

• Mandrel-bent 2.5" diameter 409 aluminized stainless steel piping ensures consistent exhaust flow and long-term durability
• Dual 4" chrome-flashed 304 stainless steel tips embossed with the Roush logo for premium appearance and corrosion resistance
• Straight-through resonator design provides very aggressive exhaust tone with minimal restriction
• CAD-engineered using OEM manufacturer data for precise fitment

Installation Features:

• Bolt-on installation using factory OEM mounting points and hangers
• No cutting, welding, or custom fabrication required
• Compatible with factory Ford rear valance
• Includes all necessary mounting hardware and detailed installation instructions

This axle-back exhaust system transforms your Mustang's sound profile while maintaining the quality and precision fit that Roush Performance is known for. The pre-welded hangers and OEM-style engineering ensure a straightforward installation that can be completed with basic hand tools.

California Prop 65 Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, visit www.P65Warnings.ca.gov.