2019-2025
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 1 Hour
Difficulty Level:
Simple installation for anyone.
Installation Guides
No guide available for this part yet.
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Flowmaster Original 40 Series Center/Dual Out Oval Muffler; 3-Inch Inlet/2.50-Inch Outlet (Universal; Some Adaptation May Be Required)Find parts that fit my vehicle
Item S537014
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$89.96
1 Reviews
Our Price
$99.95 each
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Performance Muffler
- Center Inlet to Dual Outlet Configuration
- Chambered Structure
- Inlet Diameter of 3 Inches
- Outlet Diameter of 2.5 Inches
- Body Height of 4 Inches
- Body Width of 9.75 Inches
- Muffler Overall Length of 19 Inches
- Uses OEM Hangers
- Black Finish
- Aluminized Steel Construction
- Limited Lifetime Warranty
- Easy Installation
- Universal Fitment
| Brand | Flowmaster |
| Muffler Inlet Size | 3.00 Inch |
Description
Reliable Flow. Elevate the performance of your ride and rock a stronger look for your vehicle with this Flowmaster Original 40 Series Center/Dual Out Oval Muffler; 3-Inch Inlet/2.50-Inch Outlet. Sporting precision machining, it is precision engineered to replace your OEM part and give you better performance and sound.
Strong Composition. Designed for toughness, this assembly is machined from hard aluminized steel, giving it optimal toughness on the road. It features a hard black finish to guard it against corrosion and rusting.
Installation. This product is easy to install and should take about 1 hour.
Warranty. There is a limited lifetime warranty on this product.
Application. The Flowmaster Original 40 Series Center/Dual Out Oval Muffler; 3-Inch Inlet/2.50-Inch Outlet is a product with universal fitment with some adaptation needed.
Flowmaster 430402
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) Muffler
5.0
Customer Reviews (1)
Aug 14, 2022
2006 - ColeRyder
Perfect
Sounds exactly how I wanted it. Highly recommend. Great price as well.
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Bang For Your Buck 5/5
Reviews of Flowmaster Exhaust products have an average rating of 4.7 out of 5
Feb 24, 2025
Review shared from Flowmaster Outlaw Dual Exhaust System with Black Tips; Side/Rear Exit (19-25 5.3L Sierra 1500 w/o Factory Dual Exhaust)
2023 Pro -
Awsome System
You will not sneak up on anyone with this system. If you drive conservatively you can keep it to a low rumble, but step on it and bang through the gears, heads will turn because it's LOUD! I don't know if it gave me more HP but my milage did increase by about 2mpg around town. Only design flaw I found would be when sending tips to the side you can not get them in the same position, they are about 3/4 inch difference from mudflaps.
Feb 3, 2025
Review shared from Flowmaster FlowFX Dual Exhaust System with Black Tips; Side Exit (19-25 5.3L Sierra 1500 w/o Factory Dual Exhaust)
2022 Elevation - KingJenk
Great Sound For Price! Must Buy!
This is a great product and an even better price. I paid for installation included with the pricing and it only took about a hour for completion.
Jan 15, 2025
Review shared from Flowmaster 40 Series Offset/Center Oval Muffler; 3-Inch Inlet/3-Inch Outlet (Universal; Some Adaptation May Be Required)
2021 Denali - BigGuy2021
Perfect Levels
Perfect sound for my 21 Sierra 6.2L not too loud and overbearing, but provides the right amount of tone, resonance, and does not drone at cruising or highway speeds
Jan 10, 2025
Review shared from Flowmaster FlowFX Dual Exhaust System; Rear Exit (19-25 6.2L Sierra 1500)
2020 Denali - Beachowl1007
Just rght
Install this on my 2020 Sierra Denali 6.2 l.... The OEM exhaust just didn't sound like a truck. This exhaust gives the truck just enough rumble without being annoying. It's nice to have a truck that actually sounds like a truck now. Install was easy and only took about an hour or two with some basic hand tools.
Nov 11, 2024
Review shared from Flowmaster Super 44 Series Offset/Center Oval Muffler; 2.50-Inch Inlet/2.50-Inch Outlet (Universal; Some Adaptation May Be Required)
2024 SLT - OscarGarza
Owner
Great sound!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!¡!!!!!!!!!!!!!!!!!!!!
Nov 2, 2024
Review shared from Flowmaster Super 40 Series Offset/Center Oval Muffler; 3-Inch Inlet/3-Inch Outlet (Universal; Some Adaptation May Be Required)
2021 Denali - 1914
exactly what I was looking for
The particular product the Flowmaster super 40 series was exactly the note and drone I was looking for on my 2021 GMC Sierra Denali 1500. I couldn't be anymore happier than I am with this muffler.
Oct 7, 2024
Review shared from Flowmaster Outlaw Dual Exhaust System; Side/Rear Exit (14-18 5.3L Sierra 1500)
2018 Base - ConnorRigel
Flow master outlaw
Sounds great only took an hour to install with me and one other person
Sep 1, 2024
Review shared from Flowmaster 40 Series Offset/Center Oval Muffler; 3-Inch Inlet/3-Inch Outlet (Universal; Some Adaptation May Be Required)
2011 SLE - 4X4GMCtruck
Flowmaster 40 Series
Worked out great. Not too loud, but loud enough to know you are driving a truck!
Jun 18, 2024
Review shared from Flowmaster 50 Series HD Offset/Center Oval Muffler; 3-Inch Inlet/3-Inch Outlet (Universal; Some Adaptation May Be Required)
2024 - Luigig
Flowmaster 50
Excellent product made a big difference in the sound and performance
Jun 15, 2024
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (19-25 5.3L Sierra 1500)
2019 Elevation - JamesJ98
Decent
Bought this to replace my MBRP exhaust which didn't fit in the hangars at all even though it said it would with my cab and bed length. This exhaust at least the hangars lined up but it does need to be cut which is annoying. Needs to be a direct bolt on option. It sounds good. I used my original pipes so it dumped farther back to avoid excess cabin noise. Good choice because its still fairly loud.
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