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Catalytic Converter for 2003 GMC Sierra 1500

We have 45 Items In-stock.

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 - Traditional Converter, Direct Fit

$299.00 $352.82 You Save $53.82 (15%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: REPG960301
  • Location: Front
  • 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: 43 in. overall length
  • Inlet Type: Single (3-bolt welded flange)
  • Outlet Type: Single (2-bolt spinner flange)
  • Warranty: 5-year or 50,000-mile limited warranty
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Fits the following 2003 GMC Sierra 1500 Submodels

  • 6 Cyl 4.3L | SLE, SLT, SL, Base, WT
  • 8 Cyl 4.8L | SLT, SLE, SL, Base, WT
  • 8 Cyl 5.3L | SLE, SLT, SL, Base, WT
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Customer Review: (see review/s)
  • This was real easy to install just needed a second hand to get it in place

    posted by: Night mechanic on April 5, 2015

  • view all 3 reviews

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 - Traditional Converter, Direct Fit

Best Seller
$483.39 $625.56 You Save $142.17 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M6693419
  • 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
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Fits the following 2003 GMC Sierra 1500 Submodels

  • 6 Cyl 4.3L | SLE, SLT, SL, Base, WT
  • 8 Cyl 4.8L | SLT, SLE, SL, Base, WT
  • 8 Cyl 5.3L | SLE, SLT, SL, Base, WT
See more
Customer Review: (see review/s)
  • I recommend purchasing this product. Installation was easy parts are good quality. Shipment was fast. Only thing I noticed was small debris inside the tubing.

    posted by: Rent on April 1, 2014

  • view all 11 reviews

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 Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$195.89 $253.51 You Save $57.62 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M6645006
  • Location: 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-193-66, D-193-91
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 16 in. overall length
  • Notes: Inlet/Outlet Size : 2.5in. I.D.
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
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Fits the following 2003 GMC Sierra 1500 Submodels

  • 8 Cyl 4.8L | SL, SLE, SLT, Base, WT
  • 8 Cyl 5.3L | SL, SLE, SLT, Base, WT
See more
Customer Review: (see review/s)
  • Had these installed along with two Magnaflow mufflers and the exhaust sounds great, even the engine tem was reduced due to the free flowing exhaust.

    posted by: on September 4, 2009

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

Best Seller
$195.89 $253.51 You Save $57.62 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M6645006
  • 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-193-66, D-193-91
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 16 in. overall length
  • Notes: Inlet/Outlet Size : 2.5in. I.D.
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
See more

Fits the following 2003 GMC Sierra 1500 Submodels

  • 6 Cyl 4.3L | Base, SL, SLE, SLT, WT
See more
Customer Review: (see review/s)
  • Had these installed along with two Magnaflow mufflers and the exhaust sounds great, even the engine tem was reduced due to the free flowing exhaust.

    posted by: on September 4, 2009

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

$293.00 $379.17 You Save $86.17 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M66455005
  • Location: 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-193-115
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Inlet/Outlet Size : 2.25in. I.D.
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
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Fits the following 2003 GMC Sierra 1500 Submodels

  • 8 Cyl 5.3L | SL, Base, SLE, SLT, WT
See more

Magnaflow California Legal Direct-Fit Catalytic Converters

  • California/50-State Legal
  • 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 direct-fit 50-State Legal 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 50-State Direct-Fit Catalytic Converter - Traditional Converter, Direct Fit

$824.73 $1,067.30 You Save $242.57 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M66455032
  • Series: Magnaflow 50-State Direct-Fit
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • E O Number: D-193-115
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Gaskets Included
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 2003 GMC Sierra 1500 Submodels

  • 8 Cyl 5.3L | SL, Base, SLE, SLT, WT
See more

Magnaflow 50-State Direct-Fit Catalytic Converter - Traditional Converter, Direct Fit

$831.16 $1,075.62 You Save $244.46 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M66445419
  • Series: Magnaflow 50-State Direct-Fit
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • E O Number: D-193-100
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 37.25 in. overall length
  • Notes: Gaskets Included
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
See more

Fits the following 2003 GMC Sierra 1500 Submodels

  • 6 Cyl 4.3L | SL, SLE, SLT, Base, WT
  • 8 Cyl 4.8L | SL, SLE, SLT, Base, WT
  • 8 Cyl 5.3L | SL, SLE, SLT, Base, WT
See more
Customer Review: (see review/s)
  • Generally speaking the unit is quite similar to the one that was removed. The two piece design makes it easier to install by a small amount than the original one piece unit.A major difference is that the driver side converter unit is round while the new one is oval. This means that the new unit hits interference with the bottom of the vehicle before the flange makes contact at the manifold. There are two choices to make this unit work - grind down part of the flanged section of the converter where the two halves are welded together or remove the heat shield from the vehicle. I am sure the first option will void the warranty.Here is where the second significant problem became apparent. If you look at the unit from the rear the oxygen sensor for the original unit is at about the 10:00 oclock position. The Magnaflow unit connection point for the downstream oxygen sensor is at about 11:00 oclock. This means that the oxygen sensor opening is within about an inch of the heat shield - no way will it fit with the heat shield in place. With the heat shield removed there is just enough clearance for the oxygen sensor IF YOU INSTALL IT BEFORE LIFTING THE CONVERTER ASSEMBLY INTO PLACE. If you choose this option you will have to drop the driver side converter assembly to change a defective downstream oxygen sensor in the future. There is also so little clearance between the top of the oxygen sensor and the bottom of the vehicle that I am concerned that the oxygen sensor wiring will fail by rubbing the bottom of the vehicle at times.Since my son needed the truck I used the Magnaflow unit with the heat shield removed and knowing there will be future issues if we have to replace the oxygen sensor. I installed some protective plastic wire shielding to mitigate this problem and plan to check for wear on the shielding on a regular basis.One disconcerting issue was that when I ordered the unit I mentioned the difference in the shape of the driver side converter in the catalogue picture versus the original unit to the sales representative. I noted that a competitive product showed the round converter chamber on the drivers side. The sales representative spent quite a bit of time to confirm that the Magnaflow unit was a direct fit. When he returned to the phone he said that there would be no problems the catalogue picture was just arepresentation not an exact photo and that the unit I would receive would be EXACTLY like the OEM product.When I discovered the obstruction issue I did contact Magnaflow - their representative said he had never heard of any problems and that their unit was indeed exactly the same as the OEM product. A hint to them that this is not true: if one orders only the converter unit and have someone weld it into the old exhaust piping instead of the whole assembly there are different parts offered for the driver versus passenger side converters. Yet on this complete assembly the converters are identical.In summary I should have ordered the competitive product; it was also a bit less expensive. I selected the Magnaflow because my son said he had heard good reviews about their other products and had not heard of the other company.

    posted by: none on November 20, 2013

Magnaflow 50-State Direct-Fit Driver Side Catalytic Converter - Traditional Converter, Direct Fit

$494.64 $640.12 You Save $145.48 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M66445647
  • Location: Driver Side
  • Series: Magnaflow 50-State Direct-Fit
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Stainless Steel
  • E O Number: D-193-100
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 44 in. overall length
  • Notes: Gaskets Included
  • Warranty: Magnaflow 5 year / 50,000 Mile Warranty
See more

Fits the following 2003 GMC Sierra 1500 Submodels

  • 8 Cyl 6.0L | Denali
See more

Magnaflow OEM Grade (48-State Legal) Direct Fit 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)
  • 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 OEM Grade (49-State) Direct Fit Driver And Passenger Side Catalytic Converter - Traditional Converter, Direct Fit

$601.08 $777.87 You Save $176.79 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Sku#: M6651097
  • Location: Driver And Passenger Side
  • Series: Magnaflow OEM Grade (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 2003 GMC Sierra 1500 Submodels

  • 6 Cyl 4.3L | SL, SLE, SLT, Base, WT
  • 8 Cyl 4.8L | SL, SLT, SLE, Base, WT
  • 8 Cyl 5.3L | SL, SLE, SLT, Base, WT
See more

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