The Flowmaster 40 Series Chambered Muffler delivers the iconic aggressive tone that made Flowmaster famous. Designed for drivers who want a deep, powerful, high-performance exhaust note, this muffler provides strong interior and exterior resonance, making it ideal for muscle cars, trucks, and street/strip applications.

Constructed from durable 16-gauge aluminized steel and fully MIG welded, the 40 Series is built to withstand demanding use while maintaining maximum reliability. Its chambered design enhances exhaust scavenging and flow for improved performance and throttle response. Featuring a 2.50-inch offset inlet and 2.50-inch center outlet, this muffler is a universal fit for custom exhaust projects.

Key Features

• Fully MIG-welded 16-gauge aluminized steel construction

• Aggressive exterior and interior exhaust tone

• Noticeable interior resonance

• Excellent for street, strip, muscle cars, and off-road applications

• Universal fit with 2.50" offset inlet and 2.50" center outlet

• High-temperature black finish for durability

Fitment 

Universal fit for custom exhaust applications, suitable for:

• Classic muscle cars

• Late-model muscle cars

• Street rods

• Street/strip vehicles

• Trucks and SUVs

Full Product Data 

Body Height: 4.00 IN
Body Length: 13.00 IN
Body Material: Aluminized Steel
Body Width: 9.50 IN
Brand: Flowmaster
Category: Exhaust
Clamps Included: No
Color: Black
Exhaust Tip Quantity: 0 (sold separately)
Finish: High-Temperature Paint
Fitment: Universal
Grade Type: Performance
Hanger Included: No
Heat Shield Attached: No
Inlet Connection: Slip-Fit
Inlet Diameter: 2.50 IN
Inlet Inside Diameter: 2.50 IN
Inlet Location: Offset
Inlet Outside Diameter: 2.63 IN
Inlet Quantity: 1
Inlet Type: Clamp-On, Weld-On
Mount Type: Uses new hangers (not included)
Muffler Series: Original 40 Series
Muffler Type: Chambered
Outlet Connection: Slip-Fit
Outlet Inside Diameter: 2.50 IN
Outlet Location: Center
Outlet Outside Diameter: 2.63 IN
Outlet Quantity: 1
Outlet Type: Single
Overall Length: 19.00 IN
Part Type: Exhaust Muffler
Product Type: Street Mufflers
Reversible: No
Shape: Oval
Sound Level: Aggressive
Sub Category: Mufflers
Tunable: No
Universal or Specific Fit: Universal
Vehicle Type: Classic muscle car, late-model muscle car, street rod, street/strip, truck/SUV