GMC K25 Catalytic Converter

EASTERN CATALYTIC CONVERTER

Eastern catalytic converters are constructed using Eastern's proprietary NANO technology chemistry that yields highly efficient loadings for lower cost and better converter efficiency. It features high flow design that maximizes engine output and catalytic efficiency.

Specifications

• 3-way catalyst style
• 6,000 lb GVW
• Without air tube provision and oxygen sensor port
• Oval body
• 6 x 4.25 x 10 in. body, 14 in. overall length
• 2.5 in. inlet diameter
• 2.5 in. outlet diameter
• Single inlet and outlet configuration

Notes

• 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses
• Non-directional and can be installed either way
• Modification of the exhaust is required

Fits the following 1975-1978 GMC K25 submodels:

• 1975-1978: Base; 6 Cyl 4.1L;
• 1975-1978: High Sierra; 6 Cyl 4.1L;

• 1975-1978: Sierra Classic; 6 Cyl 4.1L;

• 1975-1978: Sierra Grande; 6 Cyl 4.1L;

Fits 2 more submodels. (Show all) Show less info

MAGNAFLOW 49-STATE 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.

Fits the following 1975-1978 GMC K25 submodels:

• 1978-1978: Base; 8 Cyl 5.7L; "VIN L"
• 1978-1978: High Sierra; 8 Cyl 5.7L; "VIN L"

• 1978-1978: Sierra Classic; 8 Cyl 5.7L; "VIN L"

• 1978-1978: Sierra Grande; 8 Cyl 5.7L; "VIN L"

• 1975-1978: Base; 6 Cyl 4.1L;

• 1975-1978: High Sierra; 6 Cyl 4.1L;

• 1975-1978: Sierra Classic; 6 Cyl 4.1L;

• 1975-1978: Sierra Grande; 6 Cyl 4.1L;

• 1977-1977: Base; 8 Cyl 5.0L;

• 1977-1977: High Sierra; 8 Cyl 5.0L;

• 1977-1977: Sierra Classic; 8 Cyl 5.0L;

• 1977-1977: Sierra Grande; 8 Cyl 5.0L;

• 1975-1977: Base; 8 Cyl 5.7L;

• 1975-1977: High Sierra; 8 Cyl 5.7L;

• 1975-1977: Sierra Classic; 8 Cyl 5.7L;

• 1975-1977: Sierra Grande; 8 Cyl 5.7L;

Fits 14 more submodels. (Show all) Show less info

Catco Catalytic Converter

CATCO is well known for its experience throughout the years in using spot-on manufacturing practices and innovative technologies that paved way in producing one of the world's best and fully integrated catalytic converters today. In order to meet the customer's needs, CATCO has set its standards of catalytic converters that are produced with top-quality design, material, and performance. The CATCO catalytic converter not only delivers all the necessary function that the product should provide but it gives what the customer expects and truly deserve.

Catco catalytic converter Features and Benefits:

• Constructed with a 409 stainless steel shell to give optimum durability and strength
• Designs have met EPA and CARB emission requirements as cataloged

Specifications:

• 16.5 in. overall length; 2.5 in. inlet diameter; 2.5 in. outlet diameter
• Single inlet and outlet configuration
• One catalytic converter quantity
• Ceramic honeycomb substrate material
• Stainless steel case material
• Stainless steel tube material
• Oval body
• Without oxygen sensor port
• 5-year or 50,000-mile Catco limited warranty on converter body with 25,000-mile limited warranty on emissions

Notes

49-state legal; Not for sale or use in California; Cannot be shipped to California addresses

Fits the following 1975-1978 GMC K25 submodels:

• 1977-1978: Base; 8 Cyl 5.0L;
• 1977-1978: High Sierra; 8 Cyl 5.0L;

• 1977-1978: Sierra Classic; 8 Cyl 5.0L;

• 1977-1978: Sierra Grande; 8 Cyl 5.0L;

• 1976-1978: Base; 8 Cyl 7.4L;

• 1976-1978: High Sierra; 8 Cyl 7.4L;

• 1976-1978: Sierra Classic; 8 Cyl 7.4L;

• 1976-1978: Sierra Grande; 8 Cyl 7.4L;

• 1975-1978: Base; 6 Cyl 4.1L;

• 1975-1978: Base; 8 Cyl 5.7L;

• 1975-1978: Base; 8 Cyl 6.6L;

• 1975-1978: High Sierra; 6 Cyl 4.1L;

• 1975-1978: High Sierra; 8 Cyl 5.7L;

• 1975-1978: High Sierra; 8 Cyl 6.6L;

• 1975-1978: Sierra Classic; 6 Cyl 4.1L;

• 1975-1978: Sierra Classic; 8 Cyl 5.7L;

• 1975-1978: Sierra Classic; 8 Cyl 6.6L;

• 1975-1978: Sierra Grande; 6 Cyl 4.1L;

• 1975-1978: Sierra Grande; 8 Cyl 5.7L;

• 1975-1978: Sierra Grande; 8 Cyl 6.6L;

Fits 18 more submodels. (Show all) Show less info

BOSAL CATALYTIC CONVERTER ASSEMBLY

Bosal catalytic converters are made to fit vehicle-specific requirements for backpressure, emissions, sound levels, and sensors. Designed and built for long life reliability.

Specifications

• Standard assembly with one catalytic converter
• Oval body
• Single inlet and outlet configuration

Notes

• 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses

Fits the following 1975-1978 GMC K25 submodels:

• 1978-1978: Base; 8 Cyl 7.4L;
• 1978-1978: High Sierra; 8 Cyl 7.4L;

• 1978-1978: Sierra Classic; 8 Cyl 7.4L;

• 1978-1978: Sierra Grande; 8 Cyl 7.4L;

• 1977-1978: Base; 8 Cyl 5.0L;

• 1977-1978: High Sierra; 8 Cyl 5.0L;

• 1977-1978: Sierra Classic; 8 Cyl 5.0L;

• 1977-1978: Sierra Grande; 8 Cyl 5.0L;

• 1975-1978: Base; 6 Cyl 4.1L;

• 1975-1978: Base; 8 Cyl 5.7L;

• 1975-1978: High Sierra; 6 Cyl 4.1L;

• 1975-1978: High Sierra; 8 Cyl 5.7L;

• 1975-1978: Sierra Classic; 6 Cyl 4.1L;

• 1975-1978: Sierra Classic; 8 Cyl 5.7L;

• 1975-1978: Sierra Grande; 6 Cyl 4.1L;

• 1975-1978: Sierra Grande; 8 Cyl 5.7L;

Fits 14 more submodels. (Show all) Show less info