Search parts for your 2003 Nissan Altima

14 products matching “Catalytic Converter” listed as compatible with this vehicle.

  • Walker Ultra EPA Universal Catalytic Converter 2.5" Inlet (ID) 2.5" Outlet (ID), 93203

    WalkerMPN 93203New

    In stock

    $194.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter, 99205HM

    MagnaFlowMPN 99205HMNew

    In stock

    $194.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow California Grade CARB Compliant Universal Catalytic Converter, 444105

    MagnaFlowMPN 444105New

    In stock

    $356.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow California Grade CARB Compliant Universal Catalytic Converter, 457105

    MagnaFlowMPN 457105New

    In stock

    $363.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter, 93287

    MagnaFlowMPN 93287New

    In stock

    $376.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter, 49523

    MagnaFlowMPN 49523New

    In stock

    $378.99

    Listed as compatible with this vehicle by the retailer feed.

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  • Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 39.000 IN, 54360

    WalkerMPN 54360New

    In stock

    $381.99

    Listed as compatible with this vehicle by the retailer feed.

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  • Dorman Direct Fit Catalytic Converter: No Fabrication Needed, EPA Compliant, 674-487

    DormanMPN 674-487New

    In stock

    $449.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter, 49325

    MagnaFlowMPN 49325New

    In stock

    $457.99

    Listed as compatible with this vehicle by the retailer feed.

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  • Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 13.000 IN, 16438

    WalkerMPN 16438New

    In stock

    $469.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter, 49568

    MagnaFlowMPN 49568New

    In stock

    $472.99

    Listed as compatible with this vehicle by the retailer feed.

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  • Dorman Direct Fit Catalytic Converter: No Fabrication Needed, EPA Compliant, 679-507

    DormanMPN 679-507New

    In stock

    $601.99

    Listed as compatible with this vehicle by the retailer feed.

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  • Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 37.125 IN, 54478

    WalkerMPN 54478New

    In stock

    $639.99

    Listed as compatible with this vehicle by the retailer feed.

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  • MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter, 51207

    MagnaFlowMPN 51207New

    Out of stock

    $662.99

    Listed as compatible with this vehicle by the retailer feed.

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This site contains affiliate links. We may earn a commission if you buy through them. We do not sell these products or guarantee merchant inventory. Compatibility is listed by the retailer feed for this vehicle; it is not an OEM confirmation. Catalog snapshot: Aug 15, 2026.