2019-2025
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 3 Hours
Difficulty Level:
Light to Moderate mechanical skill required.
Guaranteed 12/24 Delivery Still Available see item page for details! available on most items - Details
Talk to a Sierra 1500 Sales Tech
1-888-706-1096
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Find Mufflers for your Sierra 1500
Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler; 2.50-Inch Inlet/2.50-Inch Outlet (Universal; Some Adaptation May Be Required)Find parts that fit my vehicle
Item S503458
Sierra 1500 Sales Techs:
Connect Now
M-F 8:30A-11P, Sat-Sun 8:30A-9P
$120.56
9 Reviews
On Sale
-10% $120.56 each Was $133.95
Ship to: 43215
Please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
Choose options to add to cart.
Saved - View your saved items
We're sorry. We couldn't save this product at this time.
or use
Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- 40 Series Center/Offset Oval Muffler
- 2.5" Inlet/Outlet
- 3 Internal Baffles
- Great Street and Off-Road Application
- Reduces Interior Sound
- Mild Exterior Tone
- 16 Gauge Aluminized Steel
- Fully MIG Welded
- Moderate Installation
- 3-Year Limited Warranty
- Universal Fitment; Modifications Will Be Required
| Brand | Flowmaster |
| Muffler Inlet Size | 2.50 Inch |
Description
Out-Scavenge the Competition. The Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler - 2.5" inlet/outlet precisely places and welds 3 internal baffles to exact specifications to significantly reduce the exterior resonance and sound levels that get transmitted into the vehicle through the exhaust. Ideal for street, strip, and off-road applications.
All That and a Bag of Chips. You get all of that in addition to increased horsepower, more torque, and that deep tone that Flowmaster is famous for. Constructed using 16 gauge aluminized steel and completely MIG welded, the muffler is corrosion resistant and extremely durable, giving you not just better performance but the perfect mild exterior tone as well.
Modifications Required. This Muffler was designed to be used on mutliple applications, as it is not a direct fit replacement part. In order to install this Muffler properly on your vehicle, some modifications to the exhaust system will be required.
Warranty. Flowmaster backs this muffler and the original purchaser with a 3-year limited warranty that covers all defects or flaws in the materials or workmanship.
Application. The Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler - 2.5 in. is compatible with 1999-2025 GMC Sierra 1500 trucks.
All That and a Bag of Chips. You get all of that in addition to increased horsepower, more torque, and that deep tone that Flowmaster is famous for. Constructed using 16 gauge aluminized steel and completely MIG welded, the muffler is corrosion resistant and extremely durable, giving you not just better performance but the perfect mild exterior tone as well.
Modifications Required. This Muffler was designed to be used on mutliple applications, as it is not a direct fit replacement part. In order to install this Muffler properly on your vehicle, some modifications to the exhaust system will be required.
Warranty. Flowmaster backs this muffler and the original purchaser with a 3-year limited warranty that covers all defects or flaws in the materials or workmanship.
Application. The Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler - 2.5 in. is compatible with 1999-2025 GMC Sierra 1500 trucks.
Shop All Truck Parts And Accessories
Shop All Truck Exhaust
Shop All Truck Mufflers
Flowmaster 942542
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
- Installation Hardware and Instructions
5.0
Customer Reviews (9)
Reviews of Flowmaster Exhaust products have an average rating of 4.7 out of 5
Questions & Answers
No questions about this product yet.
Ask the First Question
