Installation Time
(approx) 1 Hour
Difficulty Level:
Simple installation for anyone.
Installation Guides
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Flowmaster 40 Series Dual In/Dual Out Oval Muffler; 2.50-Inch Inlet/2.50-Inch Outlet
(Universal; Some Adaptation May Be Required
Item S211122
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Product Information
Features, Description, Q&A, Specs & Installation
Features & Specs
- Body Height 4.00 In
- Body Length 13.00 In
- Body Material Aluminized Steel
- Body Width 9.50 In
- Category Exhaust
- Emission Code 5
- Finish High-Temperature Paint
- Fitment Universal; Some Adaptation May Be Required
- Grade Type Performance
- Inlet Connection Slip-Fit
- Inlet Diameter 2.50 In
- Inlet Inside Diameter 2.50 In
- Inlet Location Dual
- Inlet Outside Diameter 2.63 In
- Inlet Quantity 2
- Inlet Type Clamp-On, Weld-On
- Muffler Series Original 40 Series
- Muffler Type Chambered
- Outlet Connection Slip-Fit
- Outlet Inside Diameter 2.50 In
- Outlet Location Dual
- Outlet Outside Diameter 2.63 In
- Outlet Quantity 2
- Outlet Type Dual
- 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
- Vehicle Type Classic Muscle Car, Late Model Muscle Car, Street Rod, Street/Strip, Truck/SUV
- Fits Universal; Some Adaptation May Be Required
| Brand | Flowmaster |
| Muffler Inlet Size | 2.50 Inch |
| Muffler Installation Type | Clamp-On Muffler |
| Muffler Type | Chambered Muffler |
Description
Performance Muffler. The Flowmaster 40 Series Dual In/Dual Out Oval Muffler with 2.50-inch inlet and outlet is engineered to deliver an aggressive exhaust tone and improve vehicle performance. Perfect for street, strip, and off-road use, it provides the signature Flowmaster sound while optimizing exhaust flow.
Construction and Appearance. Made from durable 16 gauge aluminized steel, this chambered muffler features full MIG welding to ensure strength and longevity. It is coated with high-temperature paint to resist corrosion and maintain its aggressive black finish even under extreme heat.
Installation. Installation uses slip-fit inlet and outlet connections designed for clamp-on or weld-on methods. Moderate mechanical skills may be required, and some adaptation might be necessary for universal applications.
Application. This muffler fits universal applications and may require some modification for specific installations. It is suitable for various vehicle types including classic and late model muscle cars, street rods, street/strip vehicles, and trucks or SUVs.
Flowmaster 425404
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Install Details & What's in the Box
Installation Info
What's in the Box
- (1) Dual In/Dual Out Oval Muffler
4.7
Reviews of Flowmaster Exhaust Products (500+)
Questions & Answers
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