# MagnaFlow 49918 Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD) for 2004-2009 Audi S4

### Performance Overview

The Magnaflow OEM Grade Catalytic Converters are the perfect replacement for your stock converter. They are crafted from high-quality stainless or aluminized steel for maximum durability. They are seam-welded for unbreakable bonds with no risk of vibrations. The catalytic converters are available with a lap inserted in the point where the neck meets the catalytic converter body. The neck is carefully formed to be sure that it doesn't reach the body where it can cause trouble to the exhaust flow. As an additional safety feature, the Catalytic Converter has a heavy duty heat shield to protect it against extreme heat and give additional stability.

### Key Features

-   Brand: MagnaFlow
-   Part number: 49918
-   Product type: Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD)
-   Designed for compatible vehicle applications listed on this page

### Vehicle Fitment

-   2004 Audi S4, Note: Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans
-   2005 Audi S4, Note: Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans
-   2006 Audi S4, Note: Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans
-   2007 Audi S4, Note: Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans
-   2008 Audi S4, Note: Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans
-   2009 Audi S4, Note: Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase.

**What part number is this?**  
The listed part number is 49918.

**Is this product designed for direct replacement?**  
Yes. This product is intended to match compatible vehicle applications listed in the fitment section.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering.

### Common Searches

-   Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD) for Audi S4
-   49918 fitment
-   MagnaFlow Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD)
-   2004 Audi S4 Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD)

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2004

Audi

S4

Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

2005

Audi

S4

Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

2006

Audi

S4

Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

2007

Audi

S4

Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

2008

Audi

S4

Avant, Base, Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

2009

Audi

S4

Cabriolet; 4.2L; 2.50"; 2.50"; Automatic Trans

## Details

- **Price:** 1217.18 CAD
- **Vendor:** MagnaFlow
- **Type:** Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD)
- **Tags:** 2004 Audi S4, 2005 Audi S4, 2006 Audi S4, 2007 Audi S4, 2008 Audi S4, 2009 Audi S4, 49918, Auto Parts, Automotive, Catalytic Converter, Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD), Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-49918, Muffler, Performance Exhaust, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1217.18 CAD | In stock |

## Images

- MagnaFlow 49918 Direct Fit OEM Grade Catalytic Converter (2.5" ID/2.5" OD)

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> Source: [Standard Auto Part](www.standardautopart.com/products/magnaflow-audi-s4-catalytic-converter-49918)
> Updated: 2026-06-13