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Walker 84178 Catalytic Converter - Front
Walker CalCat Direct-Fit Catalytic Converter
Walker CalCat Part Number 84178 is a direct-fit catalytic converter built for CARB-compliant replacement on select Chevrolet applications. It is designed for a precise OE-style fit and is validated to meet California Air Resources Board standards for regulated emissions service.
Key Features
- Direct-fit design for straightforward replacement on confirmed applications
- CARB certified for use in California and other states that require CARB-compliant converters
- Stainless steel body with a ceramic substrate
- Round body shape with welded flange connections
- Front-position fitment for select Chevrolet Impala and Chevrolet Malibu models
- Walker CalCat line engineered for OBDII and non-OBD vehicle coverage
Product Details
This Walker CalCat catalytic converter is built for 2013-2015 Chevrolet Malibu, front; 2014-2015 Chevrolet Impala, front. The design uses a 3-bolt welded flange inlet and a 2-bolt welded flange outlet, with an overall length of 14 inches and a stainless steel body for durable exhaust service. Part number 84178 is also cross-referenced to 551889 for the same application.
The Walker CalCat product line focuses on direct-fit replacement converters that follow OE-style dimensions and emissions compliance requirements. For buyers searching for a 2015 Chevrolet Malibu front catalytic converter or a CARB-compliant replacement catalytic converter for a 2014 Chevrolet Impala, this part is built around the listed vehicle-specific fitment and emissions certification.
Common Problems This Part Addresses
- Failed catalytic converter emissions test results
- Check engine light concerns related to catalyst efficiency
- Restricted exhaust flow from a worn or damaged converter
- Replacement needs after corrosion or internal substrate breakdown
- CARB compliance requirements for regulated-state vehicle service
Installation Notes
Exhaust gasket is recommended during installation. Additional parts needed to complete installation are 31616 and 31532. Confirm the vehicle’s engine family number and front-position application before installation, and verify state emissions requirements for CARB-regulated replacement parts. This converter does not include an oxygen sensor port location.
Quality Assurance
Walker designs, tests, and validates CalCat converters to meet CARB standards and deliver OE-style fitment for the listed Chevrolet applications. Part number 84178 is intended for regulated emissions replacement service where CARB certification is required.
| Brand | Walker |
|---|---|
| Part Number | 84178 |
| Position | CalCat, Front |
| Mounting Hardware Included | No |
| Universal Or Specific Fit | Specific |
| Grade Type | Regular |
| Body Shape | Round |
| Inlet Type | 3 bolt welded flange |
| Outlet Type | 4 bolt welded flange |
| Body Height | 4.02 |
| Body Height | 4.020 |
| Body Length | 6.25 |
| Body Length | 6.250 |
| Body Width | 4.02 |
| Body Width | 4.020 |
| Inlet Quantity | 1 |
| Body Material | Stainless steel |
| Outlet Quantity | 1 |
| California Air Resources Board (CARB) Certified | Yes |
| Substrate Material | Ceramic |
| Overall Length | 14 |
| Overall Length | 14.000 |
| Air Tube | No |
| Air Tube Count | No |
| Converter Quantity | 1 |
| Inlet 1 Type | 3 bolt welded flange |
| Inlet Type | 3 bolt welded flange |
| Max Year Covered | 2015 |
| Min Year Covered | 2013 |
| Most Popular Make / Model | Chevrolet malibu |
| Most Popular Year | 2015 |
| Outlet 1 Outside Diameter | 1.995 |
| Outlet 1 Type | 2 bolt welded flange |
This part fits 5 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2015 | Chevrolet | Impala | 2.5L | L4 | Front | CARB Executive Order D-182-72; Engine Family Number (EFN) FGMXV02.5001; Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional part(s) needed to complete installation - 31616 and 31532; Direct Fit Type; CalCat |
| 2015 | Chevrolet | Malibu | 2.5L | L4 | Front | CARB Executive Order D-182-72; Engine Family Number (EFN) FGMXV02.5001; Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional part(s) needed to complete installation - 31616 and 31532; Direct Fit Type; CalCat |
| 2014 | Chevrolet | Impala | 2.5L | L4 | Front | CARB Executive Order D-182-72; Engine Family Number (EFN) EGMXV02.5001; Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional part(s) needed to complete installation - 31616 and 31532; Direct Fit Type; CalCat |
| 2014 | Chevrolet | Malibu | 2.5L | L4 | Front | CARB Executive Order D-182-72; Engine Family Number (EFN) EGMXV02.5001; Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional part(s) needed to complete installation - 31616 and 31532; Direct Fit Type; CalCat |
| 2013 | Chevrolet | Malibu | 2.5L | L4 | Front | CARB Executive Order D-182-72; Engine Family Number (EFN) DGMXV02.5001; Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional part(s) needed to complete installation - 31616 and 31532; Direct Fit Type; CalCat |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.