Roush 403936 Enhanced Sound Dual Cat-Back Exhaust Kit — Fits 2005-2009 Ford Mustang GT/GT500

SKU: RSH403936
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Roush

Roush engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Roush lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Experience the Roush Roar with the 403936 Cat-Back Exhaust

Unleash an aggressive, performance-oriented sound and significant power gains for your 2005-2009 Ford Mustang GT or Shelby GT500 with the Roush 403936 Enhanced Sound Dual Cat-Back Exhaust Kit. This meticulously engineered exhaust system replaces your restrictive factory setup with a high-flow design, directly contributing to increased horsepower and torque. Feel the difference in acceleration and hear the iconic Roush rumble that commands attention on the road.

Premium Construction and Drone-Free Performance

Crafted from high-quality 2.5-inch diameter stainless steel tubing, this Roush exhaust system features smooth mandrel bends. This advanced manufacturing process ensures a consistent internal diameter throughout the bends, maximizing exhaust flow compared to conventional serrated-bent pipes. While delivering an exhilarating exterior sound, the system is designed to minimize interior drone, providing a comfortable cabin experience. The kit includes 4-inch diameter tips for a bold, finished look.

  • Aggressive, enhanced exhaust sound
  • Increased horsepower and torque
  • High-flow design for optimal performance
  • Constructed from durable 2.5-inch stainless steel
  • Mandrel-bent tubing for superior flow
  • Minimizes interior drone
  • Includes stylish 4-inch exhaust tips

Give your Mustang the voice and power it deserves with the Roush 403936 Cat-Back Exhaust, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005-2009 Ford Mustang GT
2007-2009 Ford Mustang Shelby GT500

Product Details

Product Description
Part Numbers
Sizing & Fit

About Roush

Roush engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Roush lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Experience the Roush Roar with the 403936 Cat-Back Exhaust

Unleash an aggressive, performance-oriented sound and significant power gains for your 2005-2009 Ford Mustang GT or Shelby GT500 with the Roush 403936 Enhanced Sound Dual Cat-Back Exhaust Kit. This meticulously engineered exhaust system replaces your restrictive factory setup with a high-flow design, directly contributing to increased horsepower and torque. Feel the difference in acceleration and hear the iconic Roush rumble that commands attention on the road.

Premium Construction and Drone-Free Performance

Crafted from high-quality 2.5-inch diameter stainless steel tubing, this Roush exhaust system features smooth mandrel bends. This advanced manufacturing process ensures a consistent internal diameter throughout the bends, maximizing exhaust flow compared to conventional serrated-bent pipes. While delivering an exhilarating exterior sound, the system is designed to minimize interior drone, providing a comfortable cabin experience. The kit includes 4-inch diameter tips for a bold, finished look.

  • Aggressive, enhanced exhaust sound
  • Increased horsepower and torque
  • High-flow design for optimal performance
  • Constructed from durable 2.5-inch stainless steel
  • Mandrel-bent tubing for superior flow
  • Minimizes interior drone
  • Includes stylish 4-inch exhaust tips

Give your Mustang the voice and power it deserves with the Roush 403936 Cat-Back Exhaust, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005-2009 Ford Mustang GT
2007-2009 Ford Mustang Shelby GT500

Product Details

Product Description

About Roush

Roush engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Roush lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Experience the Roush Roar with the 403936 Cat-Back Exhaust

Unleash an aggressive, performance-oriented sound and significant power gains for your 2005-2009 Ford Mustang GT or Shelby GT500 with the Roush 403936 Enhanced Sound Dual Cat-Back Exhaust Kit. This meticulously engineered exhaust system replaces your restrictive factory setup with a high-flow design, directly contributing to increased horsepower and torque. Feel the difference in acceleration and hear the iconic Roush rumble that commands attention on the road.

Premium Construction and Drone-Free Performance

Crafted from high-quality 2.5-inch diameter stainless steel tubing, this Roush exhaust system features smooth mandrel bends. This advanced manufacturing process ensures a consistent internal diameter throughout the bends, maximizing exhaust flow compared to conventional serrated-bent pipes. While delivering an exhilarating exterior sound, the system is designed to minimize interior drone, providing a comfortable cabin experience. The kit includes 4-inch diameter tips for a bold, finished look.

  • Aggressive, enhanced exhaust sound
  • Increased horsepower and torque
  • High-flow design for optimal performance
  • Constructed from durable 2.5-inch stainless steel
  • Mandrel-bent tubing for superior flow
  • Minimizes interior drone
  • Includes stylish 4-inch exhaust tips

Give your Mustang the voice and power it deserves with the Roush 403936 Cat-Back Exhaust, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005-2009 Ford Mustang GT
2007-2009 Ford Mustang Shelby GT500

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