The MagnaFlow 5" x 8" Race Muffler with 3.5" inlet and outlet is built for high performance applications where power and sound control both matter. Dyno tested and proven to support horsepower and torque gains, this muffler is engineered to reduce exhaust noise levels without choking flow, which makes it ideal for race cars, off-road builds, and performance street vehicles.

Constructed entirely from stainless steel, including the body, end caps, and perforated core, this muffler is designed for long term durability in extreme environments. Its reversible design allows for flexible installation in custom exhaust setups, while MagnaFlows fully welded construction ensures strength and reliability. Backed by a lifetime warranty, this race muffler delivers performance you can count on.

Included Items

• (1) MagnaFlow 5" x 8" Race Muffler (3.5" Inlet / 3.5" Outlet)

Specifications

• Muffler body size: 5" x 8"
• Inlet size: 3.5"
• Outlet size: 3.5"
• Body Length: 6"
• Body Width: 8"
• Body Height: 5"
• Overall Length: 12"
• Straight-through perforated core design
• Stainless steel body, end caps, and internal core
• Fully welded construction with stainless weld bead
• Reversible for custom installation
• Designed for high performance and racing applications
• Hanger Included: No

Fitment

• Universal fit for custom exhaust systems
• Ideal for race cars, off-road vehicles, and performance builds
• Compatible with 3.5" exhaust tubing
• Works with LS, LT, and other high-output engine setups
• Professional fabrication and welding required for installation

Tech Insight

A straight-through muffler design like this allows exhaust gases to flow with minimal restriction, which is key for maintaining horsepower in high performance applications. Unlike chambered mufflers that can disrupt flow, the perforated core design helps reduce sound levels while still supporting efficient exhaust velocity.

The use of stainless steel throughout the entire construction ensures resistance to corrosion and heat fatigue, especially important in off-road and racing environments where exhaust systems see extreme conditions. Combined with a reversible layout, this muffler gives builders flexibility without sacrificing performance.