2024-2025
2015-2023
2010-2014
2005-2009
1999-2004
1994-1998
1979-1993
Installation Time
(approx) 2 Hours
Difficulty Level:
Simple installation for anyone.
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Flowmaster 40 Series Delta Flow 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 399054
$129.56
7 Reviews
On Sale
-10% $129.56 each Was $143.95
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Unmistakable Flowmaster Exhaust Tone
- Boosts Torque and Horsepower
- 2-Chamber Design with Delta Flow Technology
- Aluminized Steel; 2.25 Offset In / 2.25 Offset Out
- Standard Outlet Style without Tip
- Install: Cut and Clamp
- Muffler Sold Individually
- Universal Fitment; Modifications Will Be Required
| Brand | Flowmaster |
| Muffler Inlet Size | 2.25 Inch |
Description
Flowmaster Rumble. There's no mistaking the rich, natural growl of a Flowmaster muffler. And, with its two-chamber design and Delta Flow Deflectors, the Flowmaster 40 Series Delta Flow Offset/Offset Oval Muffler adds that snarl to your 'Stang; all while keeping your cabin noise to minimum.
Increases Torque/Horsepower. Is your stock muffler robbing your 'Stang's performance? The two-chamber, precision-deflector design of the Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler supercharges your exhaust, giving you a marked increase in torque and horsepower.
Tough Construction. The Flowmaster 40 Series Delta Flow Center/Offset Oval Muffler is crafted from durable 16-gauge aluminized steel and is completely MIG-welded for the ultimate in strength and durability. 40 Series Mufflers also don't have any packing, so there's nothing to blow out.
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 40 Series Delta Flow Center/Offset Oval Muffler is built specifically to fit all 1979-2004 Mustangs, excluding 1999-2004 Cobras.
Flowmaster 942443
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 (7)
Reviews of Flowmaster Exhaust products have an average rating of 4.7 out of 5
Questions & Answers
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