2021-2026
2015-2020
2009-2014
2004-2008
1997-2003
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 T631888
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Product Information
Features, Description, Q&A, Specs & Installation
Features & Specs
- Inlet Diameter 2.50 IN
- Inlet Location Dual
- Outlet Location Dual
- Outlet Inside Diameter 2.50 IN
- Body Material 16 Gauge Aluminized Steel
- Body Height 4.00 IN
- Body Length 13.00 IN
- Body Width 9.50 IN
- Color Black
- Emission Code 5
- Finish High-Temperature Paint
- Fitment Universal; Some Adaptation May Be Required
- Grade Type Performance
- Inlet Connection Slip-Fit
- Inlet Inside Diameter 2.50 IN
- 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 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
| Brand | Flowmaster |
| Muffler Inlet Size | 2.50 Inch |
| Muffler Installation Type | Clamp-On Muffler |
| Muffler Type | Chambered Muffler |
Description
Original Flowmaster Sound. The Flowmaster 40 Series Dual In/Dual Out Oval Muffler with 2.50-Inch Inlet and 2.50-Inch Outlet delivers a signature aggressive exhaust tone favored by automotive enthusiasts. Designed to enhance performance and sound, it suits street, strip, and off-road applications for a bold auditory presence.
Construction and Appearance. Crafted from 16 gauge aluminized steel, this muffler is fully MIG welded to ensure durability and longevity. It features a high-temperature painted black finish that provides corrosion resistance and an aggressive look suitable for a variety of vehicle styles and applications.
Installation. The muffler utilizes slip-fit inlet and outlet connections, allowing for straightforward clamp-on or weld-on installation. Some adaptation may be required to fit specific setups, but no drilling is typically necessary.
Application. Universal fit with some adaptation may be required to accommodate different vehicle configurations and exhaust systems.
Flowmaster 425404
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Flowmaster 40 Series Dual In/Dual Out Oval Muffler to 2.50 Inch Inlet/2.50 Inch Outlet
4.7
Reviews of Flowmaster Exhaust Products (500+)
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