# MagnaFlow 21-321 OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD) for 2016-2018 Mazda Miata / Mx-5

### 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: 21-321
-   Product type: OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD)
-   Designed for compatible vehicle applications listed on this page

### Vehicle Fitment

-   2016 Mazda Miata / Mx-5, Note: Club, Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual Trans
-   2017 Mazda Miata / Mx-5, Note: Club, Grand Touring, Rf Club, Rf Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual Trans
-   2018 Mazda Miata / Mx-5, Note: Club, Grand Touring, Rf Club, Rf Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual 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 21-321.

**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 (2.25" ID/2.25" OD) for Mazda Miata / Mx-5
-   21-321 fitment
-   MagnaFlow OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD)
-   2016 Mazda Miata / Mx-5 OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD)

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2016

Mazda

Miata / Mx-5

Club, Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual Trans

2017

Mazda

Miata / Mx-5

Club, Grand Touring, Rf Club, Rf Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual Trans

2018

Mazda

Miata / Mx-5

Club, Grand Touring, Rf Club, Rf Grand Touring, Sport; 2.0L; 2.25"; 2.25"; Manual Trans

## Details

- **Price:** 713.77 CAD
- **Vendor:** MagnaFlow
- **Type:** OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD)
- **Tags:** 2016 Mazda Miata / Mx-5, 2017 Mazda Miata / Mx-5, 2018 Mazda Miata / Mx-5, 21-321, Auto Parts, Automotive, Catalytic Converter, Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-21-321, Muffler, OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD), Performance Exhaust, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 713.77 CAD | In stock |

## Images

- MagnaFlow 21-321 OEM Grade Direct Fit Catalytic Converter (2.25" ID/2.25" OD)

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> Source: [Standard Auto Part](www.standardautopart.com/products/magnaflow-mazda-miata-mx-5-catalytic-converter-21-321)
> Updated: 2026-06-13