# MagnaFlow 21-551 OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD) for 2015-2019 Mercedes-Benz Gl450 and More

### 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: 21-551
-   Product type: OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD)
-   Designed for compatible vehicle applications listed on this page

### Vehicle Fitment

-   2015 Mercedes-Benz Gl450, Note: 4Matic; 3.0L; 3.00"; 2.50"
-   2016 Mercedes-Benz Gl450, Note: 4Matic; 3.0L; 3.00"; 2.50"
-   2017 Mercedes-Benz Gle400, Note: 4Matic; 3.00"; 2.50"
-   2019 Mercedes-Benz Gle400, Note: 4Matic; 3.0L; 3.00"; 2.50"
-   2017 Mercedes-Benz Gle43 Amg, Note: 4Matic; 3.00"; 2.50"
-   2018 Mercedes-Benz Gle43 Amg, Note: 4Matic; 3.00"; 2.50"
-   2019 Mercedes-Benz Gle43 Amg, Note: 4Matic; 3.0L; 3.00"; 2.50"
-   2016 Mercedes-Benz Gle450 Amg, Note: 4Matic; 3.00"; 2.50"

### 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 21-551.

**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

-   OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD) for Mercedes-Benz Gl450
-   21-551 fitment
-   MagnaFlow OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD)
-   2015 Mercedes-Benz Gl450 OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD)

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2015

Mercedes-Benz

Gl450

4Matic; 3.0L; 3.00"; 2.50"

2016

Mercedes-Benz

Gl450

4Matic; 3.0L; 3.00"; 2.50"

2017

Mercedes-Benz

Gle400

4Matic; 3.00"; 2.50"

2019

Mercedes-Benz

Gle400

4Matic; 3.0L; 3.00"; 2.50"

2017

Mercedes-Benz

Gle43 Amg

4Matic; 3.00"; 2.50"

2018

Mercedes-Benz

Gle43 Amg

4Matic; 3.00"; 2.50"

2019

Mercedes-Benz

Gle43 Amg

4Matic; 3.0L; 3.00"; 2.50"

2016

Mercedes-Benz

Gle450 Amg

4Matic; 3.00"; 2.50"

2017

Mercedes-Benz

Gls450

4Matic; 3.0L; 3.00"; 2.50"

2015

Mercedes-Benz

Ml400

4Matic; 3.0L; 3.00"; 2.50"

## Details

- **Price:** 1944.37 CAD
- **Vendor:** MagnaFlow
- **Type:** OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD)
- **Tags:** 2015 Mercedes-Benz Gl450, 2015 Mercedes-Benz Ml400, 2016 Mercedes-Benz Gl450, 2016 Mercedes-Benz Gle450 Amg, 2017 Mercedes-Benz Gle400, 2017 Mercedes-Benz Gle43 Amg, 2017 Mercedes-Benz Gls450, 2018 Mercedes-Benz Gle43 Amg, 2019 Mercedes-Benz Gle400, 2019 Mercedes-Benz Gle43 Amg, 21-551, Auto Parts, Automotive, Catalytic Converter, Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-21-551, Muffler, OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD), Performance Exhaust, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1944.37 CAD | In stock |

## Images

- MagnaFlow 21-551 OEM Grade Direct Fit Catalytic Converter (3" ID/2.5" OD)

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> Source: [Standard Auto Part](www.standardautopart.com/products/magnaflow-mercedes-benz-gl450-catalytic-converter-21-551)
> Updated: 2026-06-13