# MagnaFlow 23403 Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD) for 1991-1995 Chevrolet Lumina and More

### 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: 23403
-   Product type: Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD)
-   Designed for compatible vehicle applications listed on this page

### Vehicle Fitment

-   1991 Chevrolet Lumina, Note: Z34; 3.4L; 2.50"; 2.50"
-   1992 Chevrolet Lumina, Note: Euro, Z34; 3.4L; 2.50"; 2.50"
-   1993 Chevrolet Lumina, Note: Euro, Z34; 3.4L; 2.50"; 2.50"
-   1994 Chevrolet Lumina, Note: Euro, Z34; 3.4L; 2.50"; 2.50"
-   1995 Chevrolet Lumina, Note: Ls; 3.4L; 2.50"; 2.50"
-   1995 Chevrolet Monte Carlo, Note: Z34; 3.4L; 2.50"; 2.50"
-   1991 Oldsmobile Cutlass Supreme, Note: Base, International, Sl; 3.4L; 2.50"; 2.50"
-   1992 Oldsmobile Cutlass Supreme, Note: Base, International, S, Sl; 3.4L; 2.50"; 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 23403.

**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 (2.5" ID/2.5" OD) for Chevrolet Lumina
-   23403 fitment
-   MagnaFlow Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD)
-   1991 Chevrolet Lumina Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD)

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

1991

Chevrolet

Lumina

Z34; 3.4L; 2.50"; 2.50"

1992

Chevrolet

Lumina

Euro, Z34; 3.4L; 2.50"; 2.50"

1993

Chevrolet

Lumina

Euro, Z34; 3.4L; 2.50"; 2.50"

1994

Chevrolet

Lumina

Euro, Z34; 3.4L; 2.50"; 2.50"

1995

Chevrolet

Lumina

Ls; 3.4L; 2.50"; 2.50"

1995

Chevrolet

Monte Carlo

Z34; 3.4L; 2.50"; 2.50"

1991

Oldsmobile

Cutlass Supreme

Base, International, Sl; 3.4L; 2.50"; 2.50"

1992

Oldsmobile

Cutlass Supreme

Base, International, S, Sl; 3.4L; 2.50"; 2.50"

1993

Oldsmobile

Cutlass Supreme

Base, International, S, Sl; 3.4L; 2.50"; 2.50"

1994

Oldsmobile

Cutlass Supreme

Base, S, Sl; 3.4L; 2.50"; 2.50"

1995

Oldsmobile

Cutlass Supreme

Base, Sl; 3.4L; 2.50"; 2.50"

1991

Pontiac

Grand Prix

Gt, Se, Ste; 3.4L; 2.50"; 2.50"

1992

Pontiac

Grand Prix

Gt, Gtp, Le, Se, Ste; 3.4L; 2.50"; 2.50"

1993

Pontiac

Grand Prix

Gt, Gtp, Le, Se, Ste; 3.4L; 2.50"; 2.50"

1994

Pontiac

Grand Prix

Gt, Gtp, Se; 3.4L; 2.50"; 2.50"

1995

Pontiac

Grand Prix

Gt, Gtp; 3.4L; 2.50"; 2.50"

## Details

- **Price:** 382.8 CAD
- **Vendor:** MagnaFlow
- **Type:** Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD)
- **Tags:** 1991 Chevrolet Lumina, 1991 Oldsmobile Cutlass Supreme, 1991 Pontiac Grand Prix, 1992 Chevrolet Lumina, 1992 Oldsmobile Cutlass Supreme, 1992 Pontiac Grand Prix, 1993 Chevrolet Lumina, 1993 Oldsmobile Cutlass Supreme, 1993 Pontiac Grand Prix, 1994 Chevrolet Lumina, 1994 Oldsmobile Cutlass Supreme, 1994 Pontiac Grand Prix, 1995 Chevrolet Lumina, 1995 Chevrolet Monte Carlo, 1995 Oldsmobile Cutlass Supreme, 1995 Pontiac Grand Prix, 23403, Auto Parts, Automotive, Catalytic Converter, Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD), Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-23403, Muffler, Performance Exhaust, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 382.80 CAD | In stock |

## Images

- MagnaFlow 23403 Direct Fit Standard Catalytic Converter (2.5" ID/2.5" OD)

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/magnaflow-chevrolet-lumina-catalytic-converter-23403)
> Updated: 2026-07-16