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Catalytic Converter for 2003 Cadillac Seville

We have 14 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 Center Catalytic Converter - Traditional Converter, Direct Fit

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$153.00 $244.86 You Save $91.86 (38%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Evan Fischer REPC960307
  • Location: Center
  • 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: 19 in. overall length
  • Inlet Type: Single (4-bolt welded flange)
  • Outlet Type: Single (2.88 in. OD)
  • Warranty: 5-year or 50,000-mile limited warranty
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
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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 Catalytic Converter - Traditional Converter, Semi-Universal

$233.36 $301.99 You Save $68.63 (23%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 448009
  • 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-193-113
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
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Magnaflow 50-State Semi-Universal Catalytic Converter - Traditional Converter, Semi-Universal

$226.84 $293.56 You Save $66.72 (23%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 46009
  • 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-193-67, D-193-89
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13 in. overall length
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
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Flowmaster 50-State Legal Semi-Universal Catalytic Converter

FLOWMASTER – 50 STATE LEGAL SEMI-UNIVERSAL CATALYTIC CONVERTER

Failed the smog test because of a malfunctioning stock catalytic converter that has come to the end of its life? Don’t panic and send your vehicle off to the junkyard when everything else is running smoothly. Replace that old catalytic converter with a new Flowmaster 50 State Semi-Universal Catalytic Converter and go back in for a retest. Since installing a new converter from any car dealer is exceedingly expensive, using a Flowmaster is a much better alternative. After installing a Flowmaster 50 State Legal Semi-Universal Catalytic Converter, your car, truck or SUV will have a much better chance of passing the smog test and it will not trip check engine lights as well. Flowmaster known as ‘the exhaust technology company,’ is a leading manufacturer of high performance exhaust systems and respected for design, innovation and engineering.

  • Great for replacing worn out factory original catalytic converters
  • Designed and manufactured in U.S.A.
  • Meticulously engineered internals with the correct precious metals won’t set off check engine lights
  • Mandatory in all states that adopted strict California vehicle emission standards
  • All California Air Resources Board (CARB) requirements are met
  • Catalyst housing is made from stainless steel for longevity
  • Made for a wide selection of popular trucks, SUVs and cars

NOTE: Requires clamps, welding or custom fabrication to install

Flowmaster 50-State Legal Catalytic Converter - Traditional Converter, Semi-Universal

$245.52 $320.94 You Save $75.42 (23%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Flowmaster 3940125
  • Series: Flowmaster 50-State Legal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-280-100
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 9 in. L x 5 in. W 4.25 in. H
  • Notes: 2.5 in. Inlet/Outlet
  • Warranty: 5-Year Or 50,000-Mile Flowmaster Warranty On Exterior Casings
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
See more

Flowmaster 50-State Legal Catalytic Converter - Traditional Converter, Semi-Universal

$286.12 $374.01 You Save $87.89 (23%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Flowmaster 3940225
  • Series: Flowmaster 50-State Legal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-280-100
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 10 in. L x 6 in. W 3.75 in. H
  • Notes: 2.5 in. Inlet/Outlet
  • Warranty: 5-Year Or 50,000-Mile Flowmaster Warranty On Exterior Casings
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
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Davico - OE Replacement Catalytic Converters (48-State Legal - No CA, No NY)

DAVICO - OE REPLACEMENT CATALYTIC CONVERTERS (48-STATE LEGAL - NO CA, NO NY)

When it comes to catalytic converters, turn to Davico. Davico's line of OE replacement catalytic converters is specifically designed to work like the original unit that came installed on your vehicle, delivering solid performance and an exact fit. Each and every one of Davico's OE replacement catalytic converters is crafted within strict standards.

Davico Exact Fit Rear Catalytic Converter - Traditional Converter, Direct Fit

$175.89 $409.13 You Save $233.24 (57%)
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Availability: In Stock
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  • Brand SKU#: Davico 19030
  • Location: Rear
  • Series: Davico Exact Fit
  • 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: 22 in. L x 7 in. W x 4.25 in. H
  • Warranty: 2-year or 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and welds
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | STS
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Davico Ultra Load Center Catalytic Converter - Traditional Converter, Direct Fit

$339.05 $400.08 You Save $61.03 (15%)
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Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Davico 49030
  • Location: Center
  • Series: Davico Ultra Load
  • 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
  • Warranty: 2-year or 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and welds
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | STS
See more

Walker - OE Replacement Catalytic Converters (50-State Legal)

WALKER - OE REPLACEMENT CATALYTIC CONVERTERS (50-STATE LEGAL)

Optimize your vehicle’s emissions control with the premium steel design and CARB-approved performance of Walker's OE replacement catalytic converters. Established in 1908, Walker is renowned in the automotive aftermarket for manufacturing a full line of exhaust system parts.

  • Engineered with higher loaded substrate
  • Premium stainless steel design
  • No trouble to bolt on
  • Equipped with OE-style flanges, hangers and brackets

Notes:

  • CARB-compliant/legal in 50 states - for sale and use in New York and California; can be shipped to addresses in New York and California.

Walker CalCat Center Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$173.44 $379.54 You Save $206.10 (54%)
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Availability: In Stock
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  • Brand SKU#: Walker 82637
  • Location: Center
  • Series: Walker CalCat
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-182-59
  • Anticipated Ship Out Time: Same day - 1 business day
  • Warranty: 5-year or 50,000-mile Walker limited warranty
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Fits the following 2003 Cadillac Seville Submodels

  • 8 Cyl 4.6L | SLS, STS
See more

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