Flowmaster Outlaw Series Race Muffler Outlaw Series Race Muffler - short 4.00 Center In / 4.00 Center Out -Aggressive - 15440S

The Flowmaster Outlaw Series Race Muffler is built for maximum performance in racing and off-road applications where a muffler is required but no strict decibel limit applies. Designed to connect directly to header collectors or integrate into an existing exhaust system, this short-body muffler delivers minimal sound reduction and maximum horsepower and torque.

Constructed from fully welded 16-gauge aluminized steel, the Outlaw Series muffler features a compact round case that allows installation in tight or limited-space applications. With no internal packing, there is nothing to burn out or deteriorate over time, ensuring consistent performance under extreme racing conditions.

Featuring a 4.00-inch center inlet and 4.00-inch center outlet, this muffler is ideal for classic muscle cars, race cars, and competition vehicles requiring unrestricted exhaust flow and an aggressive exhaust tone.

Key Features

• Extremely aggressive race exhaust sound

• Designed for racing applications where mufflers are required

• Minimal decibel reduction for maximum exhaust flow

• Short round case for tight installation areas

• Designed for maximum horsepower and torque

• No internal packing to burn out or blow out

• Fully welded 16-gauge aluminized steel construction

Fitment Information

• Universal fitment

• Suitable for classic muscle cars

• Designed for racing and competition vehicles

• Intended for off-road or track use

Muffler Specifications

• Muffler Series: Outlaw Series

• Muffler Type: Chambered

• Muffler Shape: Round

• Muffler Material: Aluminized Steel

• Muffler Body Diameter: 5.00 inches

• Muffler Body Height: 5.00 inches

• Muffler Body Width: 5.00 inches

• Muffler Body Length: 7.00 inches

• Muffler Finish: High-Temperature Paint

• Overall Length: 13.00 inches

Inlet & Outlet Specifications

• Inlet Diameter: 4.00 inches

• Inlet Location: Center

• Inlet Type: Slip-Fit / Clamp-On

• Inlet Inside Diameter: 4.00 inches

• Inlet Outside Diameter: 4.13 inches

• Inlet Quantity: 1

• Outlet Diameter: 4.00 inches

• Outlet Location: Center

• Outlet Type: Single

• Outlet Quantity: 1

• Outlet Outside Diameter: 4.13 inches

Additional Specifications

• Product Type: Race Muffler

• Part Type: Exhaust Muffler

• Grade Type: Performance

• Sound Level: Aggressive

• Engine Fuel Type: Gasoline

• Clamps Included: No

• Hangers Included: No

• Tunable: No

• Reversible: No

• California Proposition 65: No