2024-2025
2015-2023
2010-2014
2005-2009
1999-2004
1994-1998
1979-1993
Installation Time
(approx) 2 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 Mustang Sales Tech
1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Find Exhaust Accessories for your Mustang
Flowmaster Original 40 Series Offset/Offset Oval Muffler; 2.25-Inch Inlet/2.25-Inch Outlet (Universal; Some Adaptation May Be Required)Find parts that fit my vehicle
Item 399090
$111.56
65 Reviews
On Sale
-10% $111.56 each Was $123.95
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
- Undeniable Flowmaster Sound
- Quality Two-Chamber Technology
- Produces More Sound and Power
- Designed with Offset Inlet/Outlet
- Inlet/Outlet Diameter: 2.25"
- Aluminized Steel Formation
- Lifetime Limited Warranty
- Universal Fitment; Modifications Will Be Required
| Brand | Flowmaster |
| Muffler Inlet Size | 2.25 Inch |
Description
Classic Flowmaster Sound and Increased Horsepower. The internal combustion engine concealed beneath your Mustang's shiny exterior will emit a throatier, richer sound once the Flowmaster Original 40 Series Offset/Offset Oval Muffler - 2.25 has been fitted. Aside from the impact this muffler will have on the sound emitted from your car's exhaust, it will also churn out massive amounts of horsepower.
Sleek and Sporty Chambered Design. Mustang's equipped with the Flowmaster Original 40 Series Offset/Offset Oval Muffler will have a modified appearance. Embossed with the brand name, the muffler has a sturdy outer casing and two MIG-welded chambers.
Warranty. With every purchase, a Lifetime Limited Warranty comes as standard. Flowmaster's warranty can be redeemed by the original purchaser. Coverage is void in cases of misuse, poor installation and normal wear. It remains valid for workmanship or material-related defects.
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.
Application. The Flowmaster Original 40 Series Offset/Offset Oval Muffler - 2.25 is specially crafted for application with all Mustang models between the years 1979 and 2004. The set is not suitable for 1999-2004 Cobra Mustangs. The muffler contained in the box features an offset configuration to perfectly match its inlet/outlet diameter.
Flowmaster 8042443
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 Guide
4.8
Customer Reviews (65)
Questions & Answers
No questions about this product yet.
Ask the First Question
