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Flowmaster 40 Series Delta Flow Offset/Offset Oval Muffler - 2.5 in. (Universal Fitment)

AmericanMuscle no longer carries the Flowmaster 40 Series Delta Flow Offset/Offset Oval Muffler - 2.5 in. (Universal Fitment). Please check out Mustang Mufflers and Resonators for an updated selection.
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Features & Details

  • Flowmaster Exhaust Tone, Reduced Cabin Noise
  • Maximum Gains in Horsepower and Torque
  • 2-Chamber/Reflection Design
  • Stainless Steel Construction; 2.50 Offset In / 2.50 Offset Out
  • No-Tip, Standard Outlet Style
  • Simple Cut and Clamp Installation
  • Sold Individually
  • Universal Fitment; Modifications Will Be Required
Flowmaster Growl. Let the world hear your Mustang's rich rumble while keeping your cabin noise levels pristine thanks to the Flowmaster 40 Series Delta Flow Offset/Offset Oval Muffler. It features a two-chamber design and is equipped with Delta Flow Deflectors, which helps it scavenge better, giving you a deep, natural muscle car tone.

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 409s stainless 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.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

MPN# 842543

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Muffler
Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • Cobra - 93, 94, 95, 96, 97, 98
  • Cobra R - 93, 95
  • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • LX - 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • Other - 79, 80, 81, 82, 83, 84, 85, 86
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

Not Compatible with 1999-2004 Cobras

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Customer Reviews (1) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Less than 1 Hour

  • Bang For Your Buck 5 5



  • 5/5

    Installation Time: Less than 1 Hour

    January 10, 2019

    Sounds Just Like Original 40's!!!

    Nothing goes together quite like a Flowmaster and a V8 Mustang. I wish I could have done a better comparison, but I switched these out from my previous Original 40 Series in hopes of reducing some of the interior drone. Well, turns out I had a hole in the topside of my muffler, but from memory I think it may have helped. The only difference, from design, between the Original and Delta Flow is one little deflector...but it still sounds just as good and just as loud.

    GTstang12

    Year: 2004 Submodel: GT

    Helpful (1)

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