AP Exhaust Direct-Fit Catalytic Converter vs Walker Exhaust Direct-Fit Catalytic Converter
Both are EPA (federal) direct-fit converters, not CARB-legal, so buyers in California or other CARB states should look elsewhere. The AP Exhaust 645417 is the simpler choice for a standard OBDII single-inlet car; the Walker is the pick when you need a dual-inlet, single-outlet flange setup. Compare current prices at checkout, since neither listing here carries a price.
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AP Exhaust Direct-Fit Catalytic Converter
Choose the AP Exhaust if your vehicle has a single-inlet, OBDII-equipped exhaust and you want a straightforward EPA-compliant direct fit.
Pros
- EPA compliant for federal-emissions vehicles
- Ceramic catalyst substrate with sensor ports
- 409 stainless steel body resists corrosion
- Engineered for OBDII vehicles
Cons
- Not legal in CARB states such as California
- No mounting hardware included
- Single-inlet fit limits vehicle coverage
What separates them
| AP Exhaust Direct-Fit Catalytic Converter | Walker Exhaust Direct-Fit Catalytic Converter | |
|---|---|---|
| Inlet configuration | Single direct-fit inlet | Two inlets, 2-bolt welded flange |
| Outlet configuration | Single outlet | One outlet, 2-bolt welded flange |
| Emissions certification | EPA (federal) compliant | Not CARB certified; EPA federal only |
| Body material | 409 stainless steel | Stainless steel |
| Catalyst substrate | Ceramic | Not specified |
| Mounting hardware | Not included | Not included |
| Grade | Standard replacement | Premium grade |
| Overall length | Not specified |
Price history
- AP Exhaust Direct-Fit Catalytic Converter: lowest $237.07 on Oct 31 at fortluft.com.
- Walker Exhaust Direct-Fit Catalytic Converter: lowest $939.78 on Oct 31 at Amazon.
Prices at every store
AP Exhaust Direct-Fit Catalytic Converter
- BuyAutoParts.comCheck price at BuyAutoParts.com
- eBayCheck price at eBay
- fortluft.comCheck price at fortluft.com
Specs compared
| Spec | AP Exhaust Direct-Fit Catalytic Converter | Walker Exhaust Direct-Fit Catalytic Converter |
|---|---|---|
| Material Type | 409 stainless steel | — |
| Component Type | Catalytic converter | — |
| Standards Compliance | EPA compliant | — |
| Sensor Ports | Yes | — |
| Catalyst Type | ceramic | — |
| Substrate Material | Ceramic | — |
| Mounting Type | Direct Fit | — |
| Compatibility Notes | Specifically engineered for OBDII equipped vehi… | — |
| Design Highlights | Catalytic Converter | — |
| Inlet Type | — |
What reviewers say
AP Exhaust Direct-Fit Catalytic Converter
Owner feedback on AP Exhaust direct-fit converters is mixed. Many report a clean bolt-on fit and a lasting fix for check-engine codes, while others describe short service life or early substrate failure.
Pros
- Bolts up to factory flanges without modification
- Clears P0420 codes after install for many owners
- Stainless body holds up in salt-belt states
Cons
- Some units fail or rattle within a year or two
- Fit can be tight on certain models
- No CARB approval, so unusable in California
Questions and answers
- Is either converter legal in California?
- No. Both are EPA federal converters and neither is CARB certified, so they are not legal for registered vehicles in California or other CARB states.
- Which fits a dual-exhaust-inlet vehicle?
- The Walker. It has two inlets and one outlet with 2-bolt welded flanges. The AP Exhaust is a single-inlet direct fit.
- Do either include gaskets or bolts?
- No. Neither lists mounting hardware as included, so plan on buying gaskets and fasteners separately.
- Which is better for an OBDII car?
- The AP Exhaust is explicitly engineered for OBDII-equipped vehicles and has sensor ports. Check your vehicle's inlet layout before choosing.
- Is the Walker worth more than the AP Exhaust?
- Only if your vehicle needs the dual-inlet flange design. Otherwise the AP Exhaust covers standard single-inlet OBDII applications.