Description
The Flowmaster Original 40 Series Stainless Steel Muffler delivers the iconic Flowmaster aggressive exhaust sound that has made it a favorite among muscle car, street/strip, and off-road enthusiasts. Designed for drivers who want a loud, powerful exterior exhaust note with a raw, unmistakable tone, this muffler provides an authentic performance sound both inside and outside the vehicle.
Constructed from 16-gauge 409 stainless steel and fully MIG welded, this muffler offers excellent durability and corrosion resistance for demanding performance applications. Its chambered internal design creates a deep, aggressive exhaust tone with noticeable interior resonance, making it ideal for performance-oriented builds that prioritize sound and character.
Featuring a 2.50-inch offset inlet and 2.50-inch center outlet, this universal-fit muffler is well suited for a wide range of custom exhaust systems on classic muscle cars and high-performance street vehicles.
Key Features
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Original Flowmaster 40 Series aggressive exhaust tone
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Loud exterior sound with noticeable interior resonance
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Fully welded 16-gauge 409 stainless steel construction
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Chambered muffler design with no packing material
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Excellent for street, strip, and off-road applications
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Universal fit for custom exhaust systems
Fitment
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Fitment Type: Universal
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Vehicle Type: Classic Muscle Car
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Installation: Custom exhaust fabrication required
Specifications
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Brand: Flowmaster
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Product Type: Street Mufflers
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Part Type: Exhaust Muffler
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Category: Exhaust
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Sub Category: Mufflers
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Muffler Series: Original 40 Series
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Muffler Type: Chambered
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Sound Level: Aggressive
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Grade Type: Performance
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Shape: Oval
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Reversible: No
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Tunable: No
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Universal Or Specific Fit: Universal
Construction & Finish
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Body Material: 409 Stainless Steel
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Finish: Black High-Temperature Paint
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Color: Black
Dimensions
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Body Height: 4.00 IN
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Body Length: 13.00 IN
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Body Width: 9.50 IN
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Overall Length: 19.00 IN
Inlet Details
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Inlet Diameter: 2.50 IN
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Inlet Inside Diameter: 2.50 IN
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Inlet Outside Diameter: 2.63 IN
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Inlet Location: Offset
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Inlet Quantity: 1
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Inlet Type: Clamp-On
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Inlet Connection: Slip-Fit
Outlet Details
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Outlet Inside Diameter: 2.50 IN
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Outlet Outside Diameter: 2.63 IN
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Outlet Location: Center
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Outlet Quantity: 1
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Outlet Type: Single
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Outlet Connection: Slip-Fit
Installation
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Mount Type: Uses New Hangers (Not Included)
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Hanger Included: No
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Clamps Included: No
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Clamping Type: Flat Band
Compliance
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California Proposition 65: Yes
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California Proposition 65 Chemical Name: Chromium (hexavalent compounds)
