# MagnaFlow 51421 Direct Fit Standard Catalytic Converter for 1999-2001 Mazda Protege

### Performance Overview

The Direct Fit Catalytic Converter is designed with a ribbed body that can reduce expansion and distortion when the converters heat up. These ribs holds the ceramic catalyst in a proper position and it also forms a channel that shields the cushioning mat from direct exposure to exhaust gases. The ceramic coating is made for maximum surface area and flow, and the coating method is strictly controlled so that exact

### Key Features

-   Brand: MagnaFlow
-   Part number: 51421
-   Product type: Direct Fit Standard Catalytic Converter
-   Designed for compatible vehicle applications listed on this page

### Vehicle Fitment

-   1999 Mazda Protege, Note: Dx, Es, Lx; 1.6L, 1.8L
-   2000 Mazda Protege, Note: Dx, Es, Lx; 1.6L, 1.8L
-   2001 Mazda Protege, Note: Dx, Lx; 1.6L

### 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 51421.

**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 Standard Catalytic Converter for Mazda Protege
-   51421 fitment
-   MagnaFlow Direct Fit Standard Catalytic Converter
-   1999 Mazda Protege Direct Fit Standard Catalytic Converter

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

1999

Mazda

Protege

Dx, Es, Lx; 1.6L, 1.8L

2000

Mazda

Protege

Dx, Es, Lx; 1.6L, 1.8L

2001

Mazda

Protege

Dx, Lx; 1.6L

## Details

- **Price:** 569.85 CAD
- **Vendor:** MagnaFlow
- **Type:** Direct Fit Standard Catalytic Converter
- **Tags:** 1999 Mazda Protege, 2000 Mazda Protege, 2001 Mazda Protege, 51421, Auto Parts, Automotive, Catalytic Converter, Direct Fit Standard Catalytic Converter, Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-51421, Muffler, Performance Exhaust, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 569.85 CAD | In stock |

## Images

- MagnaFlow 51421 Direct Fit Standard Catalytic Converter

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/magnaflow-mazda-protege-catalytic-converter-51421)
> Updated: 2026-07-16