GMC Catalytic Converters
- Walker®Ultra™ Direct Fit Front Standard Oval and Rear Round Body Catalytic Converter and Pipe Assembly (50572)Ultra™ Catalytic Converter and Pipe Assembly (50572) by Walker®. Converter Configuration: Direct Fit. Position: Front. Catalytic Converter Body Shape: Front Standard Oval and Rear Round. With Pre and Post-Cat O2 Sensor Ports....$923.60
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (50418)Ultra™ Catalytic Converter and Pipe Assembly (50418) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. Catalytic Converter Overall Length: 47". With O2 Sensor Port. Walker is an OE supplier...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$522.02
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (53726)Ultra™ Catalytic Converter and Pipe Assembly (53726) by Walker®. Converter Configuration: Direct Fit. Position: Passenger Side. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...$629.99
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (56132)Ultra™ Catalytic Converter and Pipe Assembly (56132) by Walker®. Converter Configuration: Direct Fit. Position: Driver Side. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...$767.32
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (40630)Ultra™ Catalytic Converter and Pipe Assembly (40630) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 61.375". Walker...$397.17
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (50546)Ultra™ Catalytic Converter and Pipe Assembly (50546) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. Catalytic Converter Overall Length: 54.125". With O2 Sensor Port. Walker is an OE...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$544.19
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (40595)Ultra™ Catalytic Converter and Pipe Assembly (40595) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. Catalytic Converter Overall Length: 54.125". With O2 Sensor Port. Walker is an OE...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$404.02
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (50409)Ultra™ Catalytic Converter and Pipe Assembly (50409) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 39.25". Walker...$431.27
- Walker®Ultra™ Direct Fit Large Oval Body Catalytic Converter and Pipe Assembly (50300)Ultra™ Catalytic Converter and Pipe Assembly (50300) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Large Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 36". Walker is...$221.96
- Walker®Ultra™ Direct Fit Oval Body Catalytic Converter and Pipe Assembly (16671)Ultra™ Catalytic Converter and Pipe Assembly (16671) by Walker®. Converter Configuration: Direct Fit. Position: Front. Catalytic Converter Body Shape: Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length:...$880.43
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (16796)Ultra™ Catalytic Converter and Pipe Assembly (16796) by Walker®. Position: Front. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 26.75". With Pre and Post-Cat O2 Sensor...High precious metal load and high technology washcoat for premium performanceBody and pipe heat shields made of high quality materials for durability$610.85
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (54874)Ultra™ Catalytic Converter and Pipe Assembly (54874) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 48.38". Without O2 Sensor Port. Walker is an OE supplier...High precious metal load and high technology washcoat for premium performanceBody and pipe heat shields made of high quality materials for durability$341.41
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (16581)Ultra™ Catalytic Converter and Pipe Assembly (16581) by Walker®. Converter Configuration: Direct Fit. Position: Front. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length:...$613.75
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (54772)Ultra™ Catalytic Converter and Pipe Assembly (54772) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 48". With O2 Sensor Port. Walker is an OE supplier to...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$395.30
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (55477)Ultra™ Catalytic Converter and Pipe Assembly (55477) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length: 59.125". Walker is an...$303.88
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (55476)Ultra™ Catalytic Converter and Pipe Assembly (55476) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length: 48.5". Walker is an...$266.11
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (54480)Ultra™ Catalytic Converter and Pipe Assembly (54480) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length: 47.625". Walker is an...$365.13
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (50526)Ultra™ Catalytic Converter and Pipe Assembly (50526) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 51.375". With O2 Sensor Port. Walker is an OE supplier...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$505.22
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (50511)Ultra™ Catalytic Converter and Pipe Assembly (50511) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 50.5". Walker is an...$530.18
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (50469)Ultra™ Catalytic Converter and Pipe Assembly (50469) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 40". With O2 Sensor Port. Walker is an OE supplier to...Constructed to meet your vehicle’s specific emissions requirementsBody and pipe heat shields made of high quality materials for durability$509.68
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (50462)Ultra™ Catalytic Converter and Pipe Assembly (50462) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 45.25". Walker is an...$460.86
- Walker®Ultra™ Direct Fit Round Body Catalytic Converter and Pipe Assembly (50525)Ultra™ Catalytic Converter and Pipe Assembly (50525) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length: 52". Walker is an OE...$515.20
- Walker®Ultra™ Direct Fit Small Oval Body Catalytic Converter and Pipe Assembly (55557)Ultra™ Catalytic Converter and Pipe Assembly (55557) by Walker®. Converter Configuration: Direct Fit. Position: Driver Side. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...$345.81
- Walker®Ultra™ Direct Fit Small Oval Body Catalytic Converter and Pipe Assembly (55534)Ultra™ Catalytic Converter and Pipe Assembly (55534) by Walker®. Converter Configuration: Direct Fit. Position: Driver Side. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...$410.17
- Walker®Ultra™ Direct Fit Small Oval Body Catalytic Converter and Pipe Assembly (55533)Ultra™ Catalytic Converter and Pipe Assembly (55533) by Walker®. Converter Configuration: Direct Fit. Position: Passenger Side. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. Without O2 Sensor Port. Catalytic Converter...$356.78
- Walker®Ultra™ Direct Fit Small Oval Body Catalytic Converter and Pipe Assembly (40641)Ultra™ Catalytic Converter and Pipe Assembly (40641) by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length: 60". Walker is...$678.63
- Walker®Ultra™ Direct Fit Small Oval Body Catalytic Converter and Pipe Assembly (50430)Ultra™ Catalytic Converter and Pipe Assembly (50430) by Walker®. Converter Configuration: Direct Fit. Position: Front. Catalytic Converter Body Shape: Small Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall Length:...$664.39
- Walker®Ultra™ Direct Fit Standard Oval Body Catalytic Converter and Pipe Assembly (54951)Ultra™ Catalytic Converter and Pipe Assembly (54951) by Walker®. Position: Rear. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Standard Oval. Catalytic Converter Overall Length: 39.125". Walker is an OE...High precious metal load and high technology washcoat for premium performanceBody and pipe heat shields made of high quality materials for durability$331.07
- Walker®Ultra™ Direct Fit Standard Oval Body Catalytic Converter and Pipe Assembly (54850)Ultra™ Catalytic Converter and Pipe Assembly (54850) by Walker®. Position: Rear. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Standard Oval. Catalytic Converter Overall Length: 38.75". Without O2 Sensor Port....High precious metal load and high technology washcoat for premium performanceBody and pipe heat shields made of high quality materials for durability$329.90
- Walker®Ultra™ Direct Fit Standard Oval Body Catalytic Converter and Pipe Assembly (50486)Ultra™ Catalytic Converter and Pipe Assembly (50486) by Walker®. Converter Configuration: Direct Fit. Position: Front. Catalytic Converter Body Shape: Standard Oval. With 2 Inlets. With O2 Sensor Port. Catalytic Converter Overall...$801.22
Shop By Service Type
The GMC catalytic converter (AKA catcon or cat) was first introduced in the mid-70's, and back then, it performed only two tasks, which is exactly why it was called a two-way converter. It oxidized carbon monoxide to carbon dioxide and hydrocarbons to water and carbon dioxide (oxidation stage). In 1981, the two-way converter was replaced by a much more efficient three-way catcon, which additionally reduced nitrogen oxide emissions (reduction stage).
Today, the two-way version is used in diesel applications only, while most vehicles are equipped with a three-way catalytic converter. Located between the engine and muffler, the converter actually resembles a muffler in shape, though the construction of these two units is completely different. The body of the converter is usually made of stainless steel. Inside the body, you'll find an insulated chamber, which contains three main components of any converter: substrate (or catalyst core), washcoat, and catalyst.
The catalyst core usually has a honeycomb structure, and it's most often a ceramic monolith. Basically, it serves as a support for the washcoat. The washcoat itself is a carrier for the catalytic materials. Materials for the washcoat are chosen to form an irregular surface, which maximizes the catalytically active layer available to react with the exhaust gases. And then comes the catalyst, which is most ofter a mixture of precious metals such as palladium (oxidation catalyst) and rhodium (reduction catalyst). When the exhaust stream passes through the converter, it contacts with the catalyst and all the toxic elements covert into the harmless substances. The leaving gas is monitored by the control system to make sure it meets the emissions requirements.