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Catalytic Converter for 2004 Nissan Altima

We have 66 Items In-stock. Select your vehicle's Submodel to continue.

Evan Fischer 48-State Legal (No CA and NY) Catalytic Converter

This Evan Fischer 48-State Legal (No CA and NY) Direct Fit Catalytic Converter is manufactured from high quality and durable stainless steel catalytic case, 16-gauge aluminized steel tubes, and heat shield for long lasting durability and better protection for your vehicle. It also features honeycomb catalyst that has maximum surface area flow. OBD-II and EPA compliant catalytic converter; It is a high quality aftermarket replacement for the OEM catalytic converter. Designed for easy installation - it requires no cutting or welding!

Evan Fischer also offers comprehensive manifold converter assemblies for newer vehicle models!

  • OBD-II And EPA compliant catalytic converter
  • Requires NO cutting or welding
  • Honeycomb catalyst with maximum surface area flow
  • Covered by 5-year or 50,000-mile limited warranty
  • Not legal for sale in California and New York; Cannot be shipped to CA or NY addresses

Evan Fischer Front Catalytic Converter - Manifold Converter, Direct Fit

Best Seller
$261.27 $469.54 You Save $208.27 (44%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Evan Fischer REPN960309
  • Location: Front
  • Type: Manifold Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 19.75 in. overall length
  • Warranty: 5-year or 50,000-mile limited warranty
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Fits the following 2004 Nissan Altima Submodels

  • 4 Cyl 2.5L | S, SL, Base
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Evan Fischer Radiator Side Catalytic Converter - Traditional Converter, Direct Fit

Best Seller
$198.21 $330.34 You Save $132.13 (40%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Evan Fischer REPN960312
  • Location: Radiator Side
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13 in. overall length
  • Inlet Type: Single (6-bolt welded flange)
  • Outlet Type: Single (3-bolt welded flange)
  • Oxygen Sensor Ports: 1
  • Warranty: 5-year or 50,000-mile limited warranty
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Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
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Evan Fischer Rear Catalytic Converter - Traditional Converter, Direct Fit

Best Seller
$246.76 $457.59 You Save $210.83 (46%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Evan Fischer REPN960327
  • Location: Rear
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 39.25 in. overall length
  • Inlet Type: Single (3-bolt welded flange)
  • Outlet Type: Single (2-bolt welded flange)
  • Warranty: 5-year or 50,000-mile limited warranty
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Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
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Magnaflow 49-State Legal Semi-Universal Catalytic Converter

  • Not legal for use in California or in states adopting the California emissions standards
  • Semi-universal design – cut out your old catalytic converter and weld in the new one
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These 49-State Legal semi-universal catalytic converters have a catalyst specifically designed for your vehicle – just cut out your old catalytic converter and weld in the new one.  Engineered to cut emissions and improve performance.

Magnaflow 49-State Semi-Universal Rear Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$100.27 $129.77 You Save $29.50 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 99205HM
  • Location: Rear
  • Series: Magnaflow 49-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 9 in. L x 5.13 in. W, 13 in. overall length
  • Notes: With 2.25 inch inlet/outlet diameter. 13 in L x 5.125 W
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
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Fits the following 2004 Nissan Altima Submodels

  • 4 Cyl 2.5L | S, SL, Base
See more
Customer Review: (see review/s)
  • After instalation my car ran great the parts arrived when they said they would.

    posted by: Hmc on July 16, 2012

Magnaflow 49-State Semi-Universal Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$110.08 $142.46 You Save $32.38 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 99235HM
  • Series: Magnaflow 49-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 9 in. L x 5.13 in. W, 13 in. overall length
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
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Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
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Customer Review: (see review/s)
  • 5 star rating! would recommend shopping here first and last.

    posted by: Gene on June 4, 2015

Magnaflow California Legal Semi-Universal Catalytic Converter

  • 50-State/California Legal
  • Semi-universal design – cut out your old catalytic converter and weld in the new one
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These semi-universal 50-State Legal catalytic converters have a catalyst specifically designed for your vehicle – just cut out your old catalytic converter and weld in the new one.  Engineered to cut emissions and improve performance.

Magnaflow 50-State Semi-Universal Rear Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$169.21 $218.98 You Save $49.77 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 441304
  • Location: Rear
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-96
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13 in. overall length
  • Notes: Inlet/Outlet Size : 2in. I.D.
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
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Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow 50-State Semi-Universal Front, Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$185.78 $240.43 You Save $54.65 (23%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 444104
  • Location: Front, Driver Or Passenger Side
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-96
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13 in. overall length
  • Notes: Inlet/Outlet Size : 2in. I.D.
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow 50-State Semi-Universal Rear Catalytic Converter - Traditional Converter, Semi-Universal

$169.21 $218.98 You Save $49.77 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 441305
  • Location: Rear
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-96
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13 in. overall length
  • Notes: Inlet/Outlet Size : 2.25in. I.D.
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow OEM Grade (48-State Legal) Semi-Universal Catalytic Converters

  • Not legal for use in California or New York
  • Designed for vehicles equipped with California emissions but not registered or driven in a state adopting the California emissions standards (see item details for more information)
  • Semi-universal design – cut out your old catalytic converter and weld in the new one
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These 48-State Legal semi-universal catalytic converters have a catalyst specifically designed for your vehicle – just cut out your old catalytic converter and weld in the new one.  Engineered to cut emissions and improve performance.

Magnaflow OEM Grade (49-State) Semi-Universal Rear Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$122.43 $158.43 You Save $36.00 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 51205
  • Location: Rear
  • Series: Magnaflow OEM Grade (49-State) Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 4 Cyl 2.5L | S, SL, Base
See more

Magnaflow OEM Grade (49-State) Semi-Universal Catalytic Converter - Traditional Converter, Semi-Universal

$132.23 $171.13 You Save $38.90 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 51235
  • Series: Magnaflow OEM Grade (49-State) Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow OEM Grade (49-State) Semi-Universal Catalytic Converter - Traditional Converter, Semi-Universal

$273.39 $353.80 You Save $80.41 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 49435
  • Series: Magnaflow OEM Grade (49-State) Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 9 in. body length, 5.13 in. width, 13 in. overall length
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow 48-State Legal Direct Fit Catalytic Converters

  • Not legal for use in California or New York
  • Easy bolt-on Installation with no cutting, welding or bending required
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These 48-State Legal direct-fit catalytic converters are specifically designed to fit your vehicle with a no-hassle installation – no cutting, welding, or bending required.  Engineered to cut emissions and improve performance.

Magnaflow 49-State Direct Fit Catalytic Converter - Manifold Converter, Direct Fit

$382.59 $495.12 You Save $112.53 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 50805
  • Series: Magnaflow 49-State Direct Fit
  • Type: Manifold Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 16.29 in. overall length
  • Notes: Gaskets Included; Exhaust Manifold with Integrated Catalytic Converter Federal (Exc.CA)
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
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Fits the following 2004 Nissan Altima Submodels

  • 4 Cyl 2.5L | S, SL, Base
See more
Customer Review: (see review/s)
  • Easy installation perfect fit good tonality with RPM increase with load expected more of a performance boost but getting better over time (breaking in). Also buying the Magnaflow resonator and muffler to have the complete system will result in best performance results. Came with all parts required.

    posted by: Rob on May 19, 2014

  • view all 2 reviews

Magnaflow 49-State Direct Fit Catalytic Converter - Traditional Converter, Direct Fit

$372.75 $482.38 You Save $109.63 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 93361
  • Series: Magnaflow 49-State Direct Fit
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Gaskets Included, Without sensor ports
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 6 Cyl 3.5L | SE
See more

Magnaflow 49-State Direct Fit Rear Catalytic Converter - Traditional Converter, Direct Fit

$339.12 $438.87 You Save $99.75 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 93287
  • Location: Rear
  • Series: Magnaflow 49-State Direct Fit
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Gaskets Included
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2004 Nissan Altima Submodels

  • 4 Cyl 2.5L | S, SL, Base
See more

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