815425S Flowmaster Exhaust Muffler 4-1/2 Inch Diameter Stainless
815425S Flowmaster Exhaust Muffler 4-1/2 Inch Diameter Stainless
Available in stock (62)
815425S Flowmaster Exhaust Muffler 4-1/2 Inch Diameter Stainless
The 815425S Flowmaster Exhaust Muffler from the renowned Outlaw Series is engineered for performance enthusiasts seeking a competitive edge on the racetrack. Designed to deliver enhanced power and a refined exhaust sound, this muffler is a must-have for serious racers.
Primary Features:
- Compact & Lightweight Design: The smallest and lightest race mufflers by Flowmaster, making them an optimal choice for performance vehicles.
- Powerful Performance: When attached directly to the collector, it often produces more power than open headers, providing a significant boost in racing conditions.
- Sound Control: Takes the “edge” off the open header sound while maintaining an aggressive tone without decibel restrictions.
- Versatile Sizing: Available in multiple tubing diameter sizes including 3.00 Inch, 3.50 Inch, 4.00 Inch, and 5.00 Inch to suit various racing applications.
- Durable Construction: Made from high-quality stainless steel, ensuring longevity and resistance to the harshest racing environments.
Specifications:
- Shape: Round
- Inlet Position: Center
- Inlet Diameter: 2-1/2 Inch
- Outlet Position: Center
- Outlet Diameter: 2-1/2 Inch
- Overall Length: 12 Inch
- Case Diameter: 4-1/2 Inch
- Case Length: 6 Inch
- Internal Construction: Glass-Wrap Perforated Tube
Whether you're competing on a track with no decibel restrictions or just looking to improve your vehicle's performance, the 815425S Flowmaster Exhaust Muffler is the perfect choice for racing applications requiring efficiency and sound quality.
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Shipping & Returns
Shipping & Returns
📦 Shipping:
Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days, depending on your location.
↩️ Returns:
You may return or exchange products within 60 days of receiving your order. Items must be in original condition with proof of purchase. If your item is defective or damaged due to manufacturing issues, we’ll replace it at no additional cost.

